cant make or receive calls after 3g switched off Have Samsung Galaxy S7 edge VOLTE enabled, phone: “use VoLTE when available, Network mode: LTE/3G/2G (auto connect). Callers get put through to my voice mail. Have phone check and test app, and my phone displays no problems, Internet &s text work fine. Phone is 4G compatible, several retailers tell me. All retailers say its a network issue. Have 5G call coverage in my area, across all major networks. Currys fitted new SIM card and activated it, problem remains. How to determine whether it is a phone or network problem. Samsung technician checked my phone settings, do not disturb is switched off. All settings OK to receive and make calls. What other tests / checks can be made to precisely identify the fault, and generate a corresponding solution?