People calling me get a busy signal

1st check call blocking to make sure the phone number(s) aren't listed. Go to Phone app, Settings, block numbers. Mine wasn't listed though i added the number left it for awhile then removed it from that list. Unfortunately that did not work.

I found out what the problem is.  I went to the T-mobile store to see what they can check out for me and apparently what is causing this issue is the SPAM blocker set on the account.  I don't know how it got on there but in order for you to remove it, you will have to go into the T-mobile store or call them to remove that feature from your phone number and any other phone number on the account.  After 30 mins from them removing this, I can now recieve calls from everyone from AT&T and other carriers.  Hope this helps.

Same thing with me and I also have a Galaxy S8. Since the last few updates my phone has not been working properly. Just recently I've learned that parents have been trying to call me for days and they've been getting a busy signal. I am able to call whomever but not receiving calls is not acceptable right now. I have some sick family so my parents not being able to contact me is pushing me toward another carrier.

I am having this same problem with a Samsung Galaxy S8 phone.  Anyone that has an ATT phone who calls me gets a busy signal even though I am not on the phone.  I can call them back fine but when they call me its always a busy tone.  I checked all my phone settings and all are good just cant seem to fix the problem.  its getting frustrating, perhaps I may need to switch carriers to resolve this issue.

I have been having connection problems for almost a year. It's intermittent. People calling me get a busy signal when I'm not even on the phone. I run a business on my phone,  so unfortunately after many years with Tmobile,  I may have to change carriers. Who knows how many thousands of $ lost business in the past year. Awful!

This is happening to me as well.  I hve tried all of the recommendations and the T-mobile tech, who was great, couldn't figure it out.  Landlines do not call in from many different companies and geographic locations.

I am having the same issue. Everytime the person tries to call me it would ring one time then say ”this line is busy” and the phone hangs up. I use to receive call from the person but now I cant.

I am so sorry you are still having this issue @magenta5655286​. Did you get a chance to contact our over the phone tech support folks to get that support ticket opened? 

My doctor office stated again that they tried to get a hold of me for a week with nothing getting through and then it did. I don't know what else I can provide because someone has to tell me that they have tried to call and can't get through.