Small Company main voicemail go to two extensions Merged

We have a small company set up under a main phone with extension 101 & 102. When a call doesn't get answered the voice mail ends up only in ext102 computer app. But this voicemail is not visible from any other location (ex cell phone app). In our cituation it would be very handy that when a call comes in to the main phone the voicemail be able to be left in both ext101 & 102 computer and cell apps.

thank you for your consideration,

Johannes Waldthausen