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I’m still trying to sort it out, I bought several sim cards (3 different phone companies) and none of them work… I did notice that

+CSQ: 99,99^M

Means you have low signal, I was using no antennas so now I bought them and I’m expecting them to arrive to retry the whole operation..

I did tried these SIM cards with my phone and they were all working so… my only option now is to try the antennas and see what happens after that

Please let me know if you solve it in a different ways or send me an email so we can keep contact