Having an illegal phone in jail is the least of Tekashi 6ix9ine's legal problems.

But it is still a legal problem.

And now we all know that the troll rapper has such a phone, thanks to his baby mama Sarah snitching on social media

"Ya must be dumb. Niggas get a hold of phones all the time in jail so imagine how much easier it is to get one when you're not in actual jail but in a 'facility' bein [sic] high profile and shit," she wrote on Instagram. "Whatever a nigga doing let him to it. Cause when it's my turn a nigga gone want too [sic] kill me. Carry on because I know you still watching me from the inside."

Sarah might be pissed because 6ix9ine has seemingly cut her off, and didn't buy their daughter anything for Christmas. Whereas he allegedly bought his girlfriend Jade a G-Wagon.