Not sure I am in right forum.
I want to use 2 different devices - one takes a regular SIM (an older HTC) and, in the meantime, "test run" an S4 which takes a micro SIM. Can I have 2 different SIMs issued for the same account?
If not, can I call TM to have the micro SIM activated when I want to try the S4 - then go back to the old SIM later on?