Why does my Iphone 4s keep dropping the network

Hi there, my 4s has just started dropping the network (Vodafone) today, it has no service for 5 mins or so then full signal for about a minute. It seems to be repeating this over and over.... Has anyone any similar type of problem? If so can you help with a solution? It's driving me nuts!

Settings > General > Reset > Reset Network Settings.
Restart the device.
Replace the SIM card.
Address issue with carrier regarding their network.
Has any of the above been done?

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iPad: Issues connecting to Wi-Fi networks http://support.apple.com/kb/ts3304
WiFi Connecting/Troubleshooting http://www.apple.com/support/ipad/wifi/
How to Fix: My iPad Won't Connect to WiFi
http://ipad.about.com/od/iPad_Troubleshooting/ss/How-To-Fix-My-Ipad-Wont-Connect -To-Wi-Fi.htm
iOS: Connecting to the Internet http://support.apple.com/kb/HT1695
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~~~~~~~~~~~~~~~
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Why does my Iphone 4s keep dropping the network

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