*#*#4636#*#* – This code can be used to get some interesting information about your phone and battery.

It shows following 5 menus on screen:
– Phone information
– Battery information
– Battery history
– Usage statistics
– Wifi information

*#*#7780#*#* – This code can be used for a factory data reset.

It’ll remove following things:
– Google account settings stored in your phone
– System and application data and settings
– Downloaded applications

It’ll NOT remove:
-Current system software and bundled applications
-SD card files e.g. photos, music files, etc.

PS: Once you give this code, you get a prompt screen asking you to click on “Reset phone” button. So you get a chance to cancel your operation.

*2767*3855# – Think before you give this code. This code is used for factory format. It’ll remove all files and settings including the internal memory storage. It’ll also reinstall the phone firmware.

PS: Once you give this code, there is no way to cancel the operation unless you remove the battery from the phone. So think twice before giving this code.

*#*#34971539#*#* – This code is used to get information about phone camera.

It shows following 4 menus:
– Update camera firmware in image (Don’t try this option)
– Update camera firmware in SD card
– Get camera firmware version
– Get firmware update count

WARNING: Never use the first option otherwise your phone camera will stop working and you’ll need to take your phone to service center to reinstall camera firmware.

*#*#7594#*#* – This code can be used to change the “End Call / Power” button action in your phone. Be default, if you long press the button, it shows a screen asking you to select any option from Silent mode, Airplane mode and Power off.

You can change this action using this code. You can enable direct power off on this button so you don’t need to waste your time in selecting the option.

*#*#273283*255*663282*#*#* – This code opens a File copy screen where you can backup your media files e.g. Images, Sound, Video and Voice memo.

*#*#197328640#*#* – This code can be used to enter into Service mode. You can run various tests and change settings in the service mode.

WLAN, GPS and Bluetooth Test Codes:

*#*#232339#*#* OR *#*#526#*#* OR *#*#528#*#* – WLAN test (Use “Menu” button to start various tests)

*#*#232338#*#* – Shows WiFi MAC address

*#*#1472365#*#* – GPS test

*#*#1575#*#* – Another GPS test

*#*#232331#*#* – Bluetooth test

*#*#232337#*# – Shows Bluetooth device address

*#*#8255#*#* – This code can be used to launch GTalk Service Monitor.

Codes to get Firmware version information:

*#*#4986*2650468#*#* – PDA, Phone, H/W, RFCallDate

*#*#1234#*#* – PDA and Phone

*#*#1111#*#* – FTA SW Version

*#*#2222#*#* – FTA HW Version

*#*#44336#*#* – PDA, Phone, CSC, Build Time, Changelist number

Codes to launch various Factory Tests:

*#*#0283#*#* – Packet Loopback

*#*#0*#*#* – LCD test

*#*#0673#*#* OR *#*#0289#*#* – Melody test

*#*#0842#*#* – Device test (Vibration test and BackLight test)

*#*#2663#*#* – Touch screen version

*#*#2664#*#* – Touch screen test

*#*#0588#*#* – Proximity sensor test

*#*#3264#*#* – RAM version

Note: Some codes are not working, it depends on the phone.

Method 1. Use Android Power Control widget

Put simply, you’ve got to take control. The best way of maintaining battery life is indeed to dumb-down your all-powerful new phone by switching off features – but do it in a stylish way. Don’t just leave everything turned off all the time, or you may as well still be using a Nokia 6610.

Home screen widgets that flip Wi-Fi, Bluetooth, GPS and other power-hungry options on and off with a single press take the pain out of switching features off, while Android 1.6 added Google’s own power icon strip – set it up by long-pressing and installing the Android Power Control widget on your Home screen.

Method 2. Calm down on the status updates

No one’s saying you can’t use your Android phone’s features, but do you really need to be pinged every two minutes about a new Tweet or email? Lower the notification frequency in any apps that constantly update you on the minutiae of everything everyone does, ever, and you’ll maybe still have a bit of battery left by bed time. So you can tweet that it’s your bed time. Then tweet ‘night night’.

Method 3. Switch off auto-sync

If you’re not a power-user of the Google life-management apps, turn them off. If you can live without Google Calendar and Gmail, it’s possible to do away with auto-sync altogether – just remember to manually sync your Contacts every once in a while, in case you drop your phone in a toilet.

The app MySettings will give you numerous little toggle switches and let you turn auto-sync on and off easily, if you like the idea of having a whole screen full of power-saving icons.

Method 4. Disable 3G connectivity

Good old 2G is perfect for calls and texts, so kill 3G unless you’re planning a bit of emergency web browsing on your phone. You’ll also benefit from the general feeling of increased calmness that follows naturally once you’ve stopped staring at the 3G icon every two minutes and fretting about what your mobile network connection state is.

Method 5. Lower the screen brightness

As impressive as it might be to have your stunning OLED screen blazing out so much light that the current inhabitants of the International Space Station have to squint and lower the sun visors when you wake it up, it’s completely unnecessary. If you’re inside, Android’s default 0% brightness setting ought to do. Again, install a brightness widget on your desktop, for easy access when you do need a visibility boost.

Method 6. Turn off GPS

GPS is a monster power-drainer, and it’s barely of any use most of the time. Is it? Really? Even famed mobile-sensitive app Foursquare can do a good enough job of tracking you down via approximations based on which mobile masts you’re connected to, so unless you’re actually doing a bit of serious satnav action, switch it off. You’ll be able to hear your battery sigh with relief. Seriously. Try holding your phone to your ear as you uncheck the box.

Method 7. Monitor everything

Android 1.6 introduced a menu that lets users see precisely where their battery life is going, with the OS giving you a percentage breakdown of what sucked away all your phone’s power in the final few minutes before you actually wanted to use it. Like a mobile black box recorder.

The ‘Battery Use’ tab under Settings/About Phone will give you a detailed breakdown of what’s absorbing the most power, letting you take manual control – and delete any power-hungry apps. Try replacing them with alternatives and see if there’s a difference. One rogue app that sucks power on your particular phone could be the problem.

Method 8. Set a Wi-Fi timeout

There’s a semi-hidden ‘Advanced’ Wi-Fi management screen in Android, accessed by navigating to your phone’s ‘Wi-fi Settings’ tab and then pressing the Menu button. From here, you’re able to manually select a timeout option for the Wi-Fi connection – one of the biggest power drains on idle phones.
It may make your phone take longer to connect to Wi-Fi when you wake it up, and therefore feel a little less ‘smart’, but at least it’ll still be significantly smarter than a lump of useless plastic with a dead battery.

Method 9. Go Gothic

Modern popular thinking has it that phone screens, particularly OLED versions, use more energy when displaying brighter, whiter colours. So go Gothic. Ditch that vibrant wallpaper and select a nice, dark Home screen background, then enjoy not having to reach for the charger for at least an extra minute every day.

Method 10. Install a time-sensitive power manager

There are plenty of time and location sensitive apps on the Android Market which automatically handle your phone’s power and communications settings. For example, there’s no point leaving your phone connected to the mobile network while you’re asleep – so a simple app like Airplane Autoswitch, which kills all radio communications, will save loads of power and also help you sleep uninterrupted by notification pings.

Set it to activate Airplane mode at your usual bedtime, then get it to fire itself up again when you wake up. Simple, and your battery will make it through the night with only a minuscule drain.

Method 11. Put your phone somewhere there’s a good reception

Your phone uses more power when it’s seeking a mobile mast connection, so, believe it or not, your battery will last much longer if you leave your phone in a place where it gets a good reception. Put it on the other side of your desk, or on the windowsill. It will make a difference.

An app like Antennas will give you a ridiculously detailed summary of your phone’s current network connectivity state and all the masts in the area, if you fancy locating the optimum low-power placement within a three-mile radius of your home.

Method 12. Don’t drain the battery

The old advice to completely drain your battery to ensure proper operation doesn’t stand any more, thanks to modern lithium-ion batteries. They don’t have the charge memory issues that affected previous generation cells, and in fact perform better if you regularly charge them and keep them topped up.

Method 13. Buy an in-car charger

And leave it in the car. Buy a spare one and leave it in a friend’s car. Also leave USB cables everywhere. And get a spare battery. And a spare spare battery. There’s no guaranteed way to beat the system. It will be flat the one time you fall down a cliff and need help.

You can block calls on any Android device using different methods, however, the method might be limited by the devices. Google hasn’t incorporated Call blocking feature in Android, but some manufacturers add this feature to their Android devices. Although, the process to access the feature will vary from manufacturer to manufacturer.

Open "Phone app" and tap on the menu. In the Menu, tap on "Call Settings" to access all call settings. In "Call Settings", tap on "Call rejection".

On the next screen, tap on "Auto reject list”" and add numbers which you would like to block.

How to install APK on my Android device?

Before you make sure your device has enabled the "3rd party apps". To check this, go to: Settings, Security, and unknown sources. These "unknown sources" are simply applications that come from another source that is not the Android Market.

How to Install APK from SD card?

Step 1. First you have to download the APK file and put it somewhere on your PC where you can find it easily.

Step 2. Connect your device to your computer using the USB connector.

Step 3. Make sure your device connection settings are correct. To check this, go to Settings, Connect to PC, Standard connection, and mass storage unit.

NOTE: Sense HTC users may have to wait up to a minute until the mass storage device is visible on the computer.

Step 4. Copy the APK you have stored on your computer to the device’s SD card. Again, put it somewhere where you can find it later. We recommend creating a new folder on the SD card call, for example, “Applications.”

Step 5. Safely disconnect the device.

Step 6. Open a file browser such as Winzip, FileBro or File Manager (you can find any of these file browsers in the Android Market).

Step 7. Search the APK file that you put on your SD card, click it and then press Install.

Step 8. Read permissions and install application.

Using this trick, you can turn any web browser window or tab into an instant notepad that you can write in. There really isn't much to this trick, and it works in just about web browser on just about every platform. All you need to do is copy and paste this into the URL bar, then hit Return:

data:text/html, <html contenteditable>

After you hit return the page will clear and you'll be able to start typing away.


Step 1. Type in *3001#12345#* on your iPhone’s keypad and press call.

Step 2. You have now entered field test mode, just tap on the signal indicator on the top left of the screen and you will be able to toggle between signal bars and decibel numbers.

Step 3. Hold down the power button until you see the “slide to power off bar”, however do not power off your device.

Step 4. Keep pressing the home button until the screen closes and return to your homescreen.


Step 1. Open Internet Download Manager. On the menu bar, click DOWNLOADS and OPTIONS.

Step 2. In the GENERAL TAB, make sure that the option USE ADVANCED BROWSER INTEGRATION is checked. Now, hit the ADD BROWSER button right below the list.

Step 3. Navigate to the Program Files directory where iTunes is usually installed and pick iTunes.exe.

Step 4. On the FILES TAB, just add IPA on the file types box.

Step 5. Open iTunes. Find your desired app and click DOWNLOAD.

Step 6. IDM will now capture your action, and a dialog box will open up asking if you’d like to start the download on IDM. Hit START DOWNLOAD.

DFU stands for Device Firmware Update. DFU mode is something that you can put your iPhone iPod or iPad into where it can interact with iTunes but does not load the operating system or boot loader (this is what really differs DFU mode from recovery mode).

You need to be on DFU mode to change the firmware of your iPhone, iPad, and iPod Touch. This can serve to downgrade to a prior device firmware and operating system, or to use a custom firmware that is required for a jailbreak or SIM unlock.

How to Enter DFU Mode on iPhone, iPad, and iPod Touch:

Step 1. Connect the device to your computer and launch iTunes.

Step 2. Turn the device off (hold down the power button at the top of the device).

Step 3. Hold down the sleep/power button and home button together for exactly 10 seconds, then release the power button.

Step 4. Continue to hold down the Home button until a message appears in iTunes telling you a device in recover mode has been detected.

When you are in DFU mode your device screen will be completely black.

Even though the screen is black, that doesn’t mean the device can’t be interfaced with either iTunes or a custom firmware client (for jailbreaking, etc).

Remember that if you see the restore logo, iTunes logo, or any message on the screen, you are not in DFU mode but standard Recovery Mode. Again, DFU mode is signified by having a completely black screen on the device. If anything else is the case, repeat the steps above until you enter into DFU mode successfully.

Steps to Backup iPhone and iPad Using iTunes

Step 1. Open iTunes on your Windows or Mac system.

Step 2. Plug in your iPhone or iPad to the system.

Step 3. As soon as you plug in, you will be prompted to “Trust” or “Do Not Trust” the computer you are connected to on your iPhone or iPad. Simply, tap on “Trust this Computer“.

Step 4. Head back to the iTunes app on your system and look for the device icon as highlighted on the top right screen and click it.

How to Backup your iPhone and iPad using iTunes

Step 5. Scroll down and then click on “Back Up Now” in order to proceed to backup your iPhone using iTunes.

How to Backup your iPhone and iPad using iTunes

After you click on “Back Up Now“, you will be asked whether to encrypt your iPhone backup or not. If you opt in to encrypt it, you will be able to back up your account passwords, Health & HomeKit data. If you simply want to back up your data excluding the passwords and health app data, you can proceed without choosing to encrypt the iPhone backup.

After you are done confirming the additional options, the iPhone backup process would start instantly. You can check out the progress of your backup at the top-bottom of iTunes software window.

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