Sim-card isn't activated
Hello! Could you help me?
I'm from Belarus and I have a trouble with my iPhone 6s.
My sister has used the iPhone without having any trouble with activate sim-card. She used local carrier Velcome. Than she had reseted settings and gave the iPhone to me. I use another one MTS. And when I want to activate the iPhone, I see the mesage that sim-card isn't activate.
I checked Wi-Fi network, disconnected Activation Look in "Find iPhone", restarted... I also tried to activate my iPhone through iTunes. But nothing can help me. And I've contacted with my carrier, they said me to contact with iPhone support.
iPhone 6s, iOS 12