Question [Q] un-lock.us Trustable?

Hi!

Last week I bought a SIM-locked Sony Xperia Z and now I'm waiting for an unlock code to arrive. However, it may take several days and I bumped into the website http://un-lock.us/ which say it's free and fast.

I couldn't fins any reliable info or opinions about it, so I haven0t been so foolish of just entering my IMEI there, just in case. It seems surprising to me that no good or bad words about this service, since it provides a (AFAIK) legal service.

I would greatly appreciate any recommendation from reputable XDA members. Thank you very much