Experiencing Dropped Calls

How would a SIM card cause this?  This is a problem with a poor network.  If the SIM card was the issue the phone wouldn't even connect.  SIM card just authorizes the phone to be on your network.  Has nothing to do with poor signal due to poor network rollout.  You claim I'm well within the 5G coverage area but my 5G barely works.  I have to force my phone back to LTE to get reliable service data wise.  Phone calls.  Yea that's a lost cause.  Voice calling on my cellular phone is NOT reliable in my area anymore.  Not sure what Telus has changed.  Voice service was spotty in my building years ago but since the 5G rollout it's NOT at all reliable.