I can not recieve phone call or make a phone call

[Jack22]

can you explain why I can not recieve or make any telephone calls 

[jonsie]

There is a network issue
We are all customers so we can't give a timescale, sorry
From O2
We’re aware some customers experienced issues with voice calls this morning and our technical teams have now restored service. If you're still experiencing issues making and receiving calls, try switching your device off and on again which will help your service return to normal. We apologise for any inconvenience caused

[Kanjam876]

This has been all day! Not being able to make or receive calls .. mind boggling to say the least. Really not impressed!