No network service on 2g or 3g the phone only works on 4g. So no voice data! Help!!!

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AC Question

Hello and thanks for reading this thread, my huawei P8 on Android 6.0 the phone will only send messages and connect to 4g, it says "no service" whenever I try to switch network mode to 3g or 2g.
Things I tried with "no" results:
1. Switch phone on and off.
2. Different sim cards.
3. Network settings reset.
4. Factory reset/clear cache.