Incoming calls on my mobile have been hit and miss since I switched to GiffGaff just over a week ago now
Several times my partner has tried calling me to only get through to my voicemail service while my phone is sat beside me with full strength signal
The only reason I knew this is because she then called me on the house phone and asked why my phone was off.
I turned my voicemail off totally so it wont go there anymore.
I called myself 5 minutes ago from my Orange phone and it didnt go through, it was as if my GiffGaff mobile was turned off, or out of the service area, yet I live not 100M from the nearest O2 cellsite and its working fine I can make calls, but not recieve them.
Just tried again and it went through on the 3rd try
Something is wrong with GiffGaffs routing, or the calls being routed to them, I suspect its an O2 routing error