Q:

I brought an iPhone but now think it's stolen, what can I do? 

I bought an iPhone off a lady which by now I thank was a stolen phone:

I tried to activate the phone I got right through to wifi settings 
Now I'm stuck on iCloud settings and asked for pervious Apple ID 

There is a number displayed to call in case the phone is found, but that number is not active. 
What can I do now? 

A:

You can't do anything.  It wouldn't be a very good deterrent against theft if you could bypass the activation lock.  
Don't buy stolen goods in the future. 