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Hi @Anonymous and Welcome to the Forum,
Check your masts status via your full postcode here http://status.o2.co.uk/
And check no carrier updates are pending. Help link http://support.apple.com/kb/ht1970
As jonsie says if your original sim is the wrong size to fit in the iPhone 4s ,then you will need to carry out the simswap via the link which will take approx a few minutes to 24 hours to complete. Turn airplane mode on and off or turn the iPhone off and on to help the re connection through this period.
If it does not show the O2 icon in the status bar after that then the new sim could be faulty ,but give O2 a call first to have your account checked. Numbers are here : http://www.o2.co.uk/contactus
Give the sim card a wipe and if you have another phone try your sim in it as a process of elimination.
If your account is ok then I would pop into a high street O2 shop who will carry out another sim swap for you.
If you have not received the iPhone through O2 but through other avenues such as auction sites then it's a good change it's been imei blocked.
However If your sim is ok then the iPhone may be at fault itself and can be looked at by an Apple Genius Bar via appointment here http://www.apple.com/uk/retail/geniusbar/
Edit ; You have 14 days to return the iPhone to O2 under the faulty handset policy.
Let us know how you get on.
Check your masts status via your full postcode here http://status.o2.co.uk/
And check no carrier updates are pending. Help link http://support.apple.com/kb/ht1970
As jonsie says if your original sim is the wrong size to fit in the iPhone 4s ,then you will need to carry out the simswap via the link which will take approx a few minutes to 24 hours to complete. Turn airplane mode on and off or turn the iPhone off and on to help the re connection through this period.
If it does not show the O2 icon in the status bar after that then the new sim could be faulty ,but give O2 a call first to have your account checked. Numbers are here : http://www.o2.co.uk/contactus
Give the sim card a wipe and if you have another phone try your sim in it as a process of elimination.
If your account is ok then I would pop into a high street O2 shop who will carry out another sim swap for you.
If you have not received the iPhone through O2 but through other avenues such as auction sites then it's a good change it's been imei blocked.
However If your sim is ok then the iPhone may be at fault itself and can be looked at by an Apple Genius Bar via appointment here http://www.apple.com/uk/retail/geniusbar/
Edit ; You have 14 days to return the iPhone to O2 under the faulty handset policy.
Let us know how you get on.
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Have you done the sim swap?
Hi @Anonymous and Welcome to the Forum,
Check your masts status via your full postcode here http://status.o2.co.uk/
And check no carrier updates are pending. Help link http://support.apple.com/kb/ht1970
As jonsie says if your original sim is the wrong size to fit in the iPhone 4s ,then you will need to carry out the simswap via the link which will take approx a few minutes to 24 hours to complete. Turn airplane mode on and off or turn the iPhone off and on to help the re connection through this period.
If it does not show the O2 icon in the status bar after that then the new sim could be faulty ,but give O2 a call first to have your account checked. Numbers are here : http://www.o2.co.uk/contactus
Give the sim card a wipe and if you have another phone try your sim in it as a process of elimination.
If your account is ok then I would pop into a high street O2 shop who will carry out another sim swap for you.
If you have not received the iPhone through O2 but through other avenues such as auction sites then it's a good change it's been imei blocked.
However If your sim is ok then the iPhone may be at fault itself and can be looked at by an Apple Genius Bar via appointment here http://www.apple.com/uk/retail/geniusbar/
Edit ; You have 14 days to return the iPhone to O2 under the faulty handset policy.
Let us know how you get on.
Check your masts status via your full postcode here http://status.o2.co.uk/
And check no carrier updates are pending. Help link http://support.apple.com/kb/ht1970
As jonsie says if your original sim is the wrong size to fit in the iPhone 4s ,then you will need to carry out the simswap via the link which will take approx a few minutes to 24 hours to complete. Turn airplane mode on and off or turn the iPhone off and on to help the re connection through this period.
If it does not show the O2 icon in the status bar after that then the new sim could be faulty ,but give O2 a call first to have your account checked. Numbers are here : http://www.o2.co.uk/contactus
Give the sim card a wipe and if you have another phone try your sim in it as a process of elimination.
If your account is ok then I would pop into a high street O2 shop who will carry out another sim swap for you.
If you have not received the iPhone through O2 but through other avenues such as auction sites then it's a good change it's been imei blocked.
However If your sim is ok then the iPhone may be at fault itself and can be looked at by an Apple Genius Bar via appointment here http://www.apple.com/uk/retail/geniusbar/
Edit ; You have 14 days to return the iPhone to O2 under the faulty handset policy.
Let us know how you get on.
I've had the same issue since I updated the phone to KitKat 4.4.4, it worked perfectly before then, my partners phone is exactly the same. Tried new sims etc. but still a problem. Finally managed to download TuGo so having to use that for now. 
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All the advice we can offer is on this thread. If you think it is a software fault you should approach O2 or your phones manufacturer for help.
