So I have this problem I can't work out. I have been using my O2 SIM card in my Samsung Galaxy A51 phone for about 3 years without any issues at all. I am mostly at home but do go out every now and then. Then a few months ago, I wouldn't be able to make outbound calls and inbound calls would divert to voicemail. If I restarted the phone, I would be able to make and receive calls for a short while before the problem resumed.
I have changed my SIM card twice. The first time I changed the SIM card, it worked fine for a week or so before I started experiencing connectivity issues again. Again, restarting the phone resolves the problem temporarily.
So I then inserted my O2 SIM card in my housemate's Samsung Galaxy S8 device and it works like magic without any issues. I inserted my housemate's Vodafone SIM card into my phone, and that too works like a treat, easily able to make and receive calls. We have tested this for 5 days now, and no issues whatsoever.
This afternoon, I swapped my O2 SIM card back into my handset, the again the issues arose (calls not getting through sporadically).
I had been hoping that by swapping SIM cards, I would be able to establish whether there was an issue with O2 signal in my house, or whether there was an issue with my phone. However, this test failed to identify the issue.
Has anyone else experienced this? Any thoughts as to why I might be getting this issue?
Thanks in advance.
