New LG G3 has "No Service" even with Sim card inserted?

[AC Question]

I know my Sim card is working because it worked with my other phone. I did not update to Lollipop because of all of the glitches and bugs that have been around. I just got this phone brand new a few days ago and realized that I couldn't make any calls/texts. Oh yeah, I am getting 5 bars of signal. This is a T-mobile LG G3

 

[belodion]

Welcome to AC.

The SIM reader may be faulty, among other possibilities.

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