I'll usually just look at reviews and see what they have to say about the provider. If I see an ad and the pics look way to professional I have doubts sometimes. The ads that kill me are the ones where its a porn star in the pic. Like most of the horny guys on here don't know a porn star at a glance. sometimes I'll run the number too and see who it belongs too. Funny in the real world that would be stalking here it is verifying