I currently have an iPhone XS Max which I bought refurbished from giffgaff. It came immaculate and although the battery does go down much faster than it should, I have just put up with it for the past year or so and will shortly be replacing the battery. However, I recently stupidly took a chance and bought a iPhone 13 Pro Max from giffgaff refurbished like new. Once again, immaculate but this time the battery ran hot straight away and it lost charge at an alarming rate (100% - 0 in 3 hours). I sent it back straight away and got a refund of £679. Although cheaper than new, I do not expect to pay that kind of money for a phone that clearly has a major fault. I will avoid giffgaff in future.