Battery drain issue on iPhone 12 when it is in idle mode
I am facing battery drain issue when iPhone is idle.
Background refresh off, wifi off, bluetooth off, mobile data off, hotspot off..
No back ground running apps.
in the 10 hours of night battery drained from 100% to 90%
Previously I used iPhone 5s for 5 years and that device did not drain battery that much.
Is there any issue with device hardware or software?
Other issue is every 5 mins I am keep getting sending message from this sim.
iPhone 12, iOS 14