You have misunderstood something if you think that you have to change an IMEI. IMEI codes are not a problem in any customs. Customs may only be interested of IMEI if they try to identify stolen mobile phones.
If you have bought your mobile phone from another county the default settings are most likely not correct in your country. In my case (Blackview A8 MAX connecting to 4G but not transferring data) the information available in my service provider's web pages was not sufficient. I found the solution fr...
If you have bought your mobile phone from another county the default settings are most likely not correct in your country. In my case (Blackview A8 MAX connecting to 4G but not transferring data) the information available in my service provider's web pages was not sufficient. I found the solution fr...