People calling me get a busy signal

I am having the same issue as some of the people above.   When someone from a company calls me, they get a busy signal. I cant supply the rep with a phone number because the company has multiple land line numbers. It would also be a bit tedious to try an obtain all the effected numbers to give to Tmobile.  (Google Pixel 2)

I have exhausted all trouble shooting methods such as:
turning off the phone

factory reset (which I will not do again)

phone reset (under my phone option) 

test inbound calls from multiple people in the same area code (I can get their calls)

total clear out of any / all blocked numbers

Checking signal bars when I was told the caller could not reach me (its 3-4)

Change physical location (did nothing)

Advised company of faulty land line equipment and / or  other equipment. Was advised by company that other people in the same area code are able to receive their calls (but not me)

• contacted Tmobile tech support with days / times callers reached a busy signal. Did some minor trouble shooting with over the phohe rep , but problem still persists

If anyone out there has had a exact / similar issue and was able to resolve it, post your solution here.

I am having the same problem.  People are having to email me and ask me to call them because my phone is giving them a busy signal.

My doctor couldn’t get ahold of me!

Something going on with TMobile.  Not my phone (iphone 11).

if i call my own cell phone number from my work phone, it will ring and ring, then will eventually go to busy signal. The same thing will happen (it will go to a busy signal) if i decline the call. What the heck is this? I pay for phone service, yet i get no service. I have constant missed phone calls, and my phone never vibrates or rings. This is the most pathetic phone carrier I've had. You definitely pay for what you get.

does it happen everywhere you go or just while at work?

At work, or at home, etc. I've had it show a particular phone number called me 32 times. They said they called 3 times and explained the problem when dialing it wouldn't go through at first, then again it just hung up on them, then 3rd time it went through but never came to a voicemail prompt. 

could be a sim card issue. did you purchase the phone from TMO or from another route? and what all have you attempted on your side to try and fix it? network reset? restart the phone? flip it into airplane mode for a while then turn APM back off so the phone is forced to recheck the network connections?

New customer, just realized T-Mobile's spam blocker is overzealous, blocking many family & friends.  Watch out!