I bought a Pixel 4a through Cex six months ago. After a couple of months I found that the phone was not responding to touch very well and there are certain letters and numbers that just won't work at all. It means sending messages takes ages and trying to watch anything through my Chromecast on TV is an arduous task. Basically, the phone is not fit for purpose. I drove all the way to a shop (10 miles away from where I live) to discuss the problems with this phone as it clearly says it has a 2 year warrantee. The assistant took one look at the phone and the two tiny, hairline cracks on the screen (which happened way after all the issues started) and point blank refused to do anything about it. I would say avoid this company like the plague, they are shafters. I don't consider paying £250 for a second hand phone cheap and I'm pretty sure they're in breach of trading standards. It is not worth it, keep away from them. I suspect most phones they sell start playing up soon after purchase.