iPhone 5 missing calls with new sim

[Anonymous]

I am missing calls from people that ring me since I up graded to Iphone5 with new nano sim. I have signal bars but my calls go straight to "your call cannot be accepted at the moment blah blah blah" the caller then sends me a text to tell me about the reply I am getting. I have to switch on airplane mode then off again and if that doesn't work I have to switch my phone on and off again to get it to work. Can anyone help with this 

[Anonymous]

You could try a new nano sim and also resetting the iPhones settings.

Sometimes restoring as new can help too.

[Anonymous]

Sorry it's a nano sim I have, I have done a reset and a restore but still the same, thanks by the way

[jonsie · Accepted solution]

Some iphones do have an issue receiving the O2 network signal even when showing ok on the phone. I would make a trip to an Apple store after making an appointment and have the phone checked out. You seem to have tried the normal fixes.

[Anonymous]

Cheers Jonsie

[jonsie]

Let us know if you get it sorted by whatever means. It will undoubtably help someone else.

Good luck with it.

[Anonymous]

Hi, any luck with the problem, as I have iphone 5 and seem to have ths problem of not receiving calls and texts.  I have replaced the sim as advised by O2 and still same problem.  Now I have replaced the iphone 5 with apple and still get this intermittent missed calls problem.  any help or advice please as o2 don't seem interested. 

[MI5]

I believe O2 prioritise data over voice, so this means, in theory at least, if your phone is downloading data (syncing, updating, on internet etc) you will not have any 2G connectivity.

[Anonymous]

Sorry I have just got my phone replaced so I am waiting to see if it helps

[Anonymous]

That could be an answer but I will wait and see, I have my phone replaced by apple so lets see what happens. But thanks by the way for your help