My iPhone 4s says no service

I've had it about 4 months and it's been working just fine until this morning. It's now been a couple of hours where it's told me no service and has refused to let me call or send messages. I tried turning it on and off several times and I've been moving around all morning so it isn't lack of reception. It's getting really frustrating, please help me! Is there anything I can try?

On O2? Everyone's having that problem. They'll fix it.

Not on O2? Call the network and they'll sort it out.

Call your service provider (from another phone). This seems like its a problem with their service, unless you did something to your phone.

If you are on o2, then turn 3g off and it will get service again.

My new galexy is doin it.
If your on giffgaff or o2
there havin problems.
Not to worry

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