My 5s keeps loosing signal , 02 say it the latest update on ios 7 causing this  , is this true and what's happening about it plz ?

My iPhone 5s keeps loosing signal , I have contacted 02 , and they say it's to do with the latest ios 7 update , my messages and voice mail doesn't come through for a day or two after they are sent or left , this shouldn't be happening to a phone that is only a few months old !

Think about it.  If it were truly the iOS update, EVERYONE who has updated (and that's millions and millions of users) would be having problems.  It would be front page news.
Get a replacement SIM from O2 and see if this improves the situation.  If not, then basic troubleshooting steps are restart, reset, restore from backup and restore as new device.  If those don't work, then you have a hardware issue with the phone (not a problem with the iOS 7 update) and will need to bring it to Apple for servicing.

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