For months, some people have been having trouble calling my FIOS landline.
Sometimes when they call me, they tell me that their call gets somehow shunted into a random person's voicemail.
Sometimes when they call me, my phone will ring, I pick it up and we are unable to talk to each other.
After much trial and error, I've discovered that people calling my FIOS landline from T-Mobile phones have this problem reaching me, but when calling me from Verizon land lines or Verizon Wireless lines, there is never such a problem.
I can actually consistently get this problem reproduced, if I ask a relative or friend with T-Mobile to try and call my land line.
Can anyone advise how to get this resolved?