I have found an issue with 4G not working on the new Iphones. It is constantly stuck on 3g even when right next to an Iphone XS which is on 4G.
I have done some troubleshooting and think this must be an issue on VF's end.
1. Tried sim in an iphone Xs and works on 4G
2. Tried another networks sim in the Iphone 12 pro and 12 and works on their 4G networks
3. Have put my sim into a different iphone 12 pro and 12 and still no 4G.
3. Tried my sim in a s20 and works perfect.
So from this I am assuming the Sim is ok, and the Phone is Ok.
Anyone else had issues? Any help greatly appreciated.