@rranvi
Since both of you have the issue it's likely equipment upgrades to your local tower. You have only mentioned incoming calling being affected....any issues with outgoing calling? If not that's a good sign that this is a temporary issue that may last a couple of weeks. As suggested by @softech set your network mode to 3G only and see if this improves or fixes the issue.
If it fixes the issue then the upgrades on your local tower cause a slight delay in recieving the call and your phone detecting the incoming call and switching down to 3G from 4G LTE for it to connect. This delay a fraction of a second to long causes the default call forwarding to kick in sending the caller to your voicemail. If this is just regular infrastructure maintenance/upgrades it should clear up so switch back to the 4G LTE autoconnect setting and test call one another every few days until it appears the work has finished.
If switching to 3G only somewhat solves the issue or not at all there is a workaround to use in the meantime....download a voip provider app and choose a Canadian phone number (textnow or fongo are used by community members). Call forward ( busy/unreachable) your pm number to your voip phone # so if you have a poor or no 3G signal instead of calls being sent to voi email they will ring thru to your voip app on your phone. This will use your wifi data or mobile data (0.5mb/1 min).
While in 3G network mode if you want to check your 3G signal strength a simple test will determine if your 3G signal is contributing to your calling issue.....Go to Settings and change your network mode to 3G only. Then go to About phone>>Sim card status>>Signal strength>> ? -dBm?
Ideally you should be somewhere between -60dBm and -80dBm with -81dBm to -95dBm decent to poor but still usable. -96dBm to -101dBm barely usable and anything lower unusable. These values apply to your 3G signal strength as 4G LTE signal strength can be below -100dBm and still be usable (mine fluctuates between -99dBm and -108dBm but my 3G signal strength hovers consistently around -67dBm). Your readings may vary slightly between phones depending on the quality of their hardware (antenna) but they should have similar readings.
Of course once telus implements VoLTE calling for pm customers these issues will no longer be a problem as there will rarely be the need to switch networks to send/recieve voice calls.
