I use 3G internet. My modem works excellent in some places of my city, but in some it works terrible. Speed is low.
How can I increase the speed of it?
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You cannot "increase" the speed of the 3G connection that you have to more than what the service provider has installed or provided for. However, you can do the following to make use of as much of connectivity is available.
3G is needs a good signal and in patchy areas your packets will get lost, and will need to resend and acknowledge.. that is the main problem of it slowing down and then speeding up again.
You can solve your problem by using a GSM/CDMA/3G/HSDPA Amplifier
There are other ones out there, but these a pretty cheap.. they used to cost about 500EURO/800EURO.. but are becoming more popular.
Increase your internet speed by other tricks:
You might want to try Opera Turbo. Don't use it for anything you wouldn't do on a public machine.