Not so much a fault with the phone as with the charger. Most in car chargers cannot deliver enough power when the phone is on. The charger needs to at least a 1amp REGULATED supply.... Most cheapo charges are unregulated and drop to about 0.3amps when power is drawn from them.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion.
This is not Customer Service so we are unable to help with account specific issues.Currently using:
Pixel 7a (O2 & Lyca), One Plus 6 (Sfr), iPhone 12 Pro Max (Vodafone)