Iphone 5 3G connection issue

My phone 3G connection is full of bar, but the speed is very slow, so i try to switch on and off the cellular data, then the speed is faster back. is quite annoying of this problem.
please help!

Hi, keng chee.
Thank you for using Apple Support Communities. 
Here is a resource you may find helpful that will walk you through some troubleshooting steps for this issue. 
iPhone: Troubleshooting a cellular data connection
http://support.apple.com/kb/TS3780
Cheers,
Jason H. 

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