For a year now I have been using my Fairphone 3 with a UK SIM (Tesco) and a Belgian SIM (Mobile Vikings) installed. I haven’t had any trouble with /e/ or the phone, it’s a great combination.
Soon I’ll be moving to Spain so I decided to swap out the Belgian SIM for a Spanish one (Orange) which I bought on eBay. The seller activated it with my ID and it works. But I started noticing severe battery drain after installing it, and the phone is warmer than usual.
To give you an idea, with the UK/BE SIMs installed, the battery lasted two full days, even with the phone configured at maximum performance. But with the UK/ES SIMs, I could barely get through the day without having to plug it in.
At first, I thought it may have had something to do with the Spanish SIM constantly looking for networks. I fixed it on one network with a good connection, but that didn’t change a thing. Yesterday I took it out and everything is normal again.
What can be the cause of this? Is there something wrong with the SIM? Do I need to check the configuration?