I really don't think it's possible to steal your personal data from a SIM card.
About legitness of doulci, idk really, but ih8sn0w said "it's a really generic bypass u have there", so that means that it actually works.
A lot of fake services were in the past on symbyan, android... So why it could not be today? Just google it and you can see it, that sim card can be hacked.. and hackers can make a copy of a sim card and have full acess what was on sim card, even a payments can be done.. Why does my sim card work anymore?? can you explane that?? I had 4 months old sim card almost new sim card... I don't know, may be it works with doulci.. everything is suspicious to me on doulci..