When thy e htc say invalid sim

[AC Question]

When I put the Sim in the HTC it says invalid Sim,what do I do

 

[Laura Knotek]

Hi and welcome to Android Central.

Which HTC phone do you have?

If you're using a SIM from a different carrier than the one it was originally branded to is it unlocked?

If the phone and SIM are from the same carrier, have you tried getting a new SIM from your carrier?

Is your phone's SIM puk locked?