Chancers! Don't be suckered in by their quote...
Lured in by the high value on my old phone, and the added Quidco cashback was a bonus in deciding to use MCM to recycle my old phone.
Sent them my phone, after which it took three days to process. From an initial £70, the value dropped by 90% to just £7 because the water damage indicator had activated. I live in Scotland, where it is pretty wet!!
Despite that, the phone worked perfectly well, was well looked after and I had no problems with it at any time throughout it's life so to have the value chopped as much as it was, it was an insult to my intelligence. Valuation was rejected and order was cancelled, and I now await the return of my handset. I don't expect I'll get my cashback either.
Don't take the initial value MCM offer as gospel; unless the phone is pristine out of the box they'll find something wrong to drive the value down.