I was getting bad battery drain on my new 4xl and was worried I couldn't keep it. I tried turning on wifi calling as recommend by websites with p4 battery tips. I get half or less of full bars at home so I thought I'd try it out. I saw the difference right away and so far a few days later I'm pleased with my battery life now. If anyone has spotty reception and doesn't have wifi calling activated I would highly recommend turning it on for this phone. I didn't have drain like this with my last few phones which is strange but at least it's fixed.