Apologies in advance for the long read.
I recently started a new contract with O2 3 weeks ago, and for the first week (at most) it was working absolutely fine. Then last week I discovered that I could send texts (although would take some time to reach the person) and couldnt make or receive phone calls. I did a SIM swap this weekend which allowed me to send texts properly but not receive them, and make phone calls but not receive them. I went back to the store where they tried my SIM in another phone which showed no different results, implying the SIM is the problem still. Last night I did another SIM swap and still nothing has changed. I tried the SIM in my old phone and the same problems are occurring - send but not receive texts, make but not receive phone calls.
I find it unlikely that 3 SIM cards in a row are faulty (bearing in mind the first one worked for a week), which to me means that either my phone is somehow corrupting or breaking the SIM card, or it is some sort of account problem that is allowing outgoing but not incoming phone traffic.
My next plan, unless somebody suggests otherwise is to attempt another SIM swap (number 3), but this time quarantine my current phone and put it straight into my old phone, or another that they have in the store perhaps - to eliminate the possibility that my phone is at fault.
