I had a shocking experience in London with iSmash. Took my phone in for a new battery. They took longer than stated and then when I came back to collect they said the phone was water damaged on the faceID sensor. They showed me what they say was a watermark on the sensor. They then tried to say that FaceID might not now work, even though it was working fine when I dropped it in and they had witnessed that in their many tests. They also ask for all your logins which I was hugely uncomfortable with as they can access all your save passwords etc. Not good or safe in my opinion. Anyhow, they went on to replace the battery and then at the end state that they would not warranty their work for the year due to this supposed water damage. I argued but ultimately had no choice but accept to get my phone back. The story doesn't end there.... a few months later and my phone starts to go from 50+% to zero and to crash. Turn it back on and magically that 50+% has vanished... puff... gone. This happened for a few days and then it eventually crashed for good and the phone will not charge or even show a charging symbol (tried wireless charging and the wire). Nada! One dead phone. My advice, go buy a mini power bank for the money you would spend with them. They are crooks in my opinion.