Hi I have problems with the sim card on iPhone 5s, iOS 9.3.2, bought in Apple store in UK and it's never locked. I'm from Macedonia and have problem with operator VIP ( Member of Telekom Austira Group). When i put the sim card from this operator i can not use the iPhone because it shows me invalid sim card. I don't know what the problem is, because when I put a sim card from another opeator in Macedonia, phone works. Please help me if you know any information. Thank you!