iphone network/sim problems (O2)

in iPhone edited January 2014
i know this is probably more of an O2 problem but i thought id ask here in case anybody knew anything.

basically i replaced my damaged iphone with a brand new one today (which O2 sent out to me). the woman on the phone said i may keep the SIM card should i wish to keep my number. which i did.

everything was fine. i registered the new iphone with itunes etc, nothing much was needed. and then i even texted a friend something, and he also replied to me.

then all of a sudden this evening at work i noticed there was no signal - "no service" in the top left corner. and even when i got home it was still the same and hasn't changed since.

anybody know what might be up?
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