By giving your mobile number and verifying it,you guys are putting yourself at risk.Op might use it for some illegal activities or for any perceivable mischief.I dont mean to doubt op's intention but verifying your mobile for a complete stranger and too for a small amount of 90k Satoshi is horrible thing to do online
if op does illegal activities with it report him and he will be banned, to test the op's illegal activity give him a number which you
don't use and have no credit on then keep checking to see what pops up in the sms