on 01-10-2014 23:07
on 02-10-2014 06:40
Try turning your phone off and on to refresh the connection.
Any O2 shop can supply free of charge ~ a sim adapter than you place your nano sim in to make it the correct size to fit in your phone.
O2 now only send out nano SIM cards but they should also come with this adapter.
on 02-10-2014 08:09
Nano sim cards should come with an adapter to use the sim in any phone or go into an O2 store and ask if they still have any combi sims available and do another sim swap (or ask the store to do it.
Make sure you get the correct sim for your account though as PAYG and contract are different ones.
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone7 (EE)