If the user’s phone has moved out of the 5G coverage and enters the 4G coverage, or vice versa, the network icon will change on the phone’s status bar. Solution: This issue is caused by differences in network coverage .
Read moreDo I need to change my 4G SIM for 5G?
The short answer is that you do not need a new SIM for 5G , and your existing 4G SIM will work in your 5G phone; however, there may be some limitations. The SIM card used in 4G networks is based on the same specifications as the 3G SIMs (USIM), making them backwards and forward compatible.
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