Can anyone explain? Two identical unlocked Samsung J3 mobiles. Charge both to 100%. Put BT SIM in one and Giffgaff SIM in other. Put both on standby. The one with BT Sim needs recharging after 24hours but one with Giffgaff lasts further 72hours. Repeat process but switch SIMs to other phone. The same thing happens. WHY???
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The strength of mobile signal could be a factor, do you get a stronger signal with GiffGaff (O2) than BT?
Even so, the difference between 24 and 72 hours seems a lot.
There are comments regarding volte calling on Android’s newer operating system.
Try disabling volte. Perhaps the signal is weaker with one service provider.