The following tutorial will detail to you how to enforce 3G only connection on your Android device - phone, tablets or others. But why? Most Android phones and tablets have capabilities of both 3G/HSDPA data connection speed as well and 2G data capability. Naturally, Android may fluctuate between the two, or even decide to prefer the 2G as it consumes less battery and data, as a power-saver strategy.
However, to get the best internet experience, you may need to set your device to use 3G only if you are not on wireless broadband.
How To Do This:
1. Go to SETTINGS
2, Then, proceed to MORE SETTINGS or MORE...
3. Select WIRELESS AND NETWORKS
4. Select 3G SERVICE
5. For multi-SIM devices, ensure the right SIM card is selected.
6. The second option will give you opportunity to select
a. Automatic 2G GSM and 3G WCDMA
b. 3G WCDMA ONLY.
Select the second option and you are good.
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source; howtutor.com