WIFI Vs 3G BATTERY USAGE

It all depends on the signal strength. If you are in the area where 3G is good but a weak wifi signal, wifi  will use more energy to remain connected. and also, if wifi signal is full and 3G signal is weak, using wifi will yeild better battery life. If both signals are robust, then using wifi will effectively use less energy if you are using your phone actively.If you are a passive user who is not streaming media or chattting or anything else that needs you to be connected, then you should stick with 3G as the radio turns off after few seconds non usage. Wifi on the other hand remains on. So effectively uses more battery than the passive users..

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Why does 3G mobile cellular signal use more power than 2G?

2G (original GSM) was deliberately designed to be very power-efficient only for low-data rate voice services.   3G was designed to be more spectrally efficient and to deliver higher-rate data services, but at the expense of using more power.

Specifically:
- 2G uses 200kHz channel vs 5MHz for WCDMA (25x more). Power is roughly proportional to bandwidth
- GSM used a very power-efficient constant envelope modulation scheme (GMSK). 3G uses CDMA and higher order modulation (up to 16QAM or even 64QAM), which needs much better linearity and hence the radio draws far more power.  2.5G (GPRS) and 2.75G (EDGE) use QAM, which deliver more data and are more spectrally efficient (bps/Hz) so they coverge with 3G somewhat.

You can improve battery life significantly by turning of 3G and only using 2G if you stick to voice  but if you are going to web-surf then the better data-rate (bps) and data efficiency probably make 3G more efficient.

This trend continues: 4G offers far faster data rates and is more spectrally efficient, but draws even more power.


Note: the above discussion is for GSM to WCDMA; for IS95/cdma2000 the situation is similar but the specifics are different
Check out on out post about Wifi and 3G battery Usage Here

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How to Install Whatsapp on s40 Java Phones Like Asha 200 & 205

This tutorial will guide you to install Whatsapp messenger on your non-supported java phones like the Nokia Asha 200, Asha 205 and any other non-supported java phones.
Please take note you need to free up your internal memory before proceeding, at least have more than 4MB free.
1. Download the Raw file from here note the file is a zipped file.

2. unzip the downloaded zipped file, then copy the whole folder to your memory card (advisable to do this step on a computer).

3. Now goto the folder, DO NOT launch the whatsapp application inside the folder just yet.

4. Copy the application from the memory card to your My Apps or Games.

5. Now go back to the initial folder and delete it.

6. Now go to the whatsapp application in your phone, click the option button and click update version, let it update then you can open the application…thats all.

It might ask for update and upgrade, dont worry, just allow it to upgrade and update.

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DIFFERENCE BETWEEN SLEEP AND HIBERNATE IN WINDOWS

Windows 7 provides several options for conserving power when you are not using your PC. These options include Sleep, Hibernate, and Hybrid Sleep and are very useful if you are using a laptop. Here’s the difference between them.
Note: this article is meant primarily for beginners. Obviously ubergeeky readers will already know the difference between power modes.

Sleep Mode

Sleep mode is a power-saving state that is similar to pausing a DVD movie. All actions on the computer are stopped and any open documents and applications are put in memory. You can quickly resume normal, full-power operation within a few seconds. Sleep mode is basically the same thing as “Standby” mode.
The Sleep mode is useful if you want to stop working for a short period of time. The computer doesn’t use much power in Sleep mode.

Hibernate

The Hibernate mode saves your open documents and running applications to your hard disk and shuts down the computer, which means once your computer is in Hibernate mode, it uses zero power. Once the computer is powered back on, it will resume everything where you left off.
Use this mode if you won’t be using the laptop for an extended period of time, and you don’t want to close your documents.

Hybrid Sleep

The Hybrid Sleep mode is a combination of the Sleep and Hibernate modes meant for desktop computers. It puts any open documents and applications both in memory and on your hard disk, and then puts your computer into a low-power state, allowing you to quickly wake the computer and resume your work. The Hybrid Sleep mode is enabled by default in Windows on desktop computers and disabled on laptops. When enabled, it automatically puts your computer into Hybrid Sleep mode when you put it into Sleep mode.
Hybrid Sleep mode is useful for desktop computers in case of a power outage. When power resumes, Windows can restore your work from the hard disk, if the memory is not accessible.

Where are the options?

The Sleep and Hibernate options are accessed using the arrow button next to the Shut down button on the Start menu.

If you don’t see the Sleep option or the Hibernate option, it may be for one of the following reasons:

• Your video card may not support the Sleep mode. Refer to the documentation for your video card. You can also update the driver.
• If you don’t have administrative access on the computer, you may have to refer to the administrator to change the option.
• The power-saving modes in Windows are turned on and off in your computer’s BIOS (basic input/output system). To turn on these modes, restart your computer and then enter the BIOS setup program. The key for accessing BIOS differs for each computer manufacturer. Instructions for accessing BIOS generally displays on the screen as the computer boots. For more information, see your computer’s documentation or check the website for your computer’s manufacturer.
• If you don’t see the Hibernate option, the Hybrid Sleep option is mostly likely enabled. We will explain how to enable and disable the Hybrid Sleep mode later in this article.

How Do I Wake Up the Computer?

Most computers can be woken up by pressing the power button. However, every computer is different. You might need to press a key on the keyboard, click a mouse button, or lift the laptop’s lid. Refer to your computer’s documentation or the manufacturer’s website for information about waking it from a power-saving state.

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