poor cell phone reception

Hello,
I am having a problem with the sound quality when reviving calls from Cell phones. The call breaks up a lot almost like the caller is going in a tunnel. Land line calls seem to be fine.

Any idea on how I can start to fix this?
I need to fix this or try some other company.

All incoming cell calls are the same?

same hereā€¦ All incoming calls that come from cell phones are almost impossible to hear :frowning: