Iphone data connectivity issue

Me and my wife are having problems with our iphones data connectivty with 3g (for the iphone 4s) and 3g&LTE (for the iphone 5). Although the cellular signal is frequently 4 or five bars, most often than not, we cannot browse or use any app because the data connection seems hanged. We always resort to either enabling/disabling the airplane mode, turning the cellular data off and on OR turning off and on the device and the browsing will be normal again and our apps able to access the internet. This experience is becoming a disappointment and we hope you could help us. Im sure we are not an isolated case as most of my friends complain similar experience. Thanks in advance.

Settings > General > Reset > Reset Network settings.
If the issue continues, basic troubleshooting from the User's Guide is reset, restart, restore (first from backup then as new). Try each of these in order until the issue is resolved.
It may also be necessary to contact the carrier to troubleshoot the issue.

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