Missing calls yet have a signal

[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. 

[Liquid]

Try restoring your Iphone. Just to rule out a software conflict.

Are you doing anything on your phone when the person attemps to call? App/web?

[Anonymous]

I've done the restore, and no the mobile would be sitting beside me and I get a call on the house phone telling me they are trying to ring me but keep getting same message, Cheers by the way

[Liquid]

Is it just a couple of people? Or anyone?

Is it intermittent eg bob calls you somtimes and gets through other times he gets that message?

[jonsie]

Try a hard reset by holding the home and sleep buttons until the Apple logo appears.

[Anonymous]

It's usually my kids because they are the ones that try the other number I have. So I don't know who else I miss as it doesn't go to the answer service to leave a message. It is intermittent yes

[Liquid]

Just read on the gsm recordings that could mean there is a hardware issue (phone) or over congestion at the switch board.

Would these problems happen around the same time normally?

[Anonymous]

Yes they do happen around same time between 3.30 and 7 pm 

[Liquid]

Hmm sounds as though the gsm theory might be right:(

Do you have another handset you could try the sim in? Just to rule out your phone being at fault.

[Anonymous]

No I'm the only one that uses the nano sim