Why does my iPhone 5 lose signal when trying to make a call or use cellular data?

Hello,
I've had this problem for a few weeks now and it's becoming really annoying. Every time I try to make a call, or call voicemail, it takes me 10 or so attempts to connect. When it doesn't connect I get 'searching' in the top left hand corner whilst my phone try's to find signal again. I have the same problem when using 3G - it'll be fine for a while and then I lose my signal all together. This happens in places where I have enjoyed full signal strength in the past. I have dropped my phone or done anything to it to cause this. I've checked with my network provider, Giffgaff but it seems to be more of a phone problem rather than network.
Has anyone had anything similar? If so how did you fix it? I'm thinking I need to take it into my local store to get it looked it.

Hello Mathias267,
Thank you for using Apple Support Communities.
For more information, take a look at:
iPhone: Troubleshooting No Service
http://support.apple.com/kb/ts4429
iPhone: Troubleshooting a cellular data connection
http://support.apple.com/kb/ts3780
Have a nice day,
Mario

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