SIM error. on T9 franklin hot spot. how to fix

What is the carrier sim that you purchased?

Okay I purchased SIM card's that said they were compatible with T-Mobile devices.. Does that matter..

If it's a Tmobile branded hot spot then you will need a Tmobile Sim.

Do I have to use T-Mobile SIM in this device... And how do I go about reset SIM

Try resetting the Sim card.