Message Blocking activated but I can't undo it

What a nightmare!(read till the end) . Spent about 40 hours working on this issue. Went to T-Mobile stores . When to a TMobile corporate store. Troubleshooted maybe 100 different ways and times and with different people. Called support , technicians , opened tickets . I was told I would get call back in 72 hours never did. Fast forward two weeks later. I tried one last thing. Technician said that because my plan changed we had to clear the cache on the towers and reset the network. She did that on her end  and finally this nightmare was over. It worked  

I am currently going through this and I'm seriously to the point of I'm done with T-Mobile after this. And it's a number that they assigned to me for my smartwatch since I had to add a line. It's really screwed up when they assign you the number but yet they have the number blocked and they don't even know how to unblock it. I literally was to the point of almost having a stroke I was so so pissed off and aggravated over it and then to top it off instead of getting the good promo for a free smartwatch and then the other one being $30 I'm having to pay almost $700 but yet they said I could take two billing cycles for the promo to show on my account. I've never ever had it taken two billing cycles let alone one full billing cycle for things to show up on my bill it's usually within 24 hours. And then the one line is not even showing a smartwatch so I can't even pair it to my phone and use it

"can be" enabled is the condundrum. There needs to be a better and more definitive way to ascertain the root cause of Message blocking in order to resolve the "what" or "whom" is causing the blocking of a particular message. 

Message blocking can be enabled if you get reported for spamming or if your bill is past due.  These forms of message blocking can only be removed by Customer Care and Customer Support.

It's unfortunate how randomly issues happen with T-Mobile. It seems they are a little weak in the technology arena and do not have robust testing and monitoring protocols for their systems.

All of a sudden, I'm having the same issue with a group sms text which as worked find until the last 24 hours. Other texts work fine I and another member of our group are now getting 

"Free Msg: Recipient unable to receive message - Message Blocking is active"

I have absolutely no blocking set up.

Had the same issue with our IPHONE 8 and IPHONE 12s. All Txt to android users was getting the "Free Msg: Unable to send message- Message Blocking is active". After trying most suggestions online, BTW none worked. Called T-Mobile support and was transferred to a specialist who walked me through similar steps. None worked. What worked was T-Mobile had the blocking active on the account. T-Mobile needed to fix on their side (removed the blocking) and I can now txt with family members nationwide and they can txt me without getting blocked. Thanks for fixing T-Mobile…….

I had this issue for a year so far. Tried everything and got a temporary fix at the T-Mobile store.

today I figured out how to do it on my end, you can try: I logged into my T-Mobile account and went to message blocking at turned it off.

hope you get a fix for yours. I got an esim for my business number added to my personal phone number and I was having issues with my business number and it was effecting my clients. 
they literally thought I blocked them, that’s a fun conversation to have.

im definitely not happy with tmobiles lack of help in this issue.

Ron, did you ever figure out why this happened or get a fix? This just started on my phone last night and it seems that all Android phone numbers are blocked. I am on iPhone 11. I never changed any settings or blocked the so called blocked numbers.

I was informed today by T-Mobile text support that T-Mobile and Apple are blocking my outgoing texts. Only outgoing texts to android devices. I was told that is in effect until 4 August. WTF?!? I too recently purchased the iPhone 13Pro to take advantage of 5G. Little did I know it would lead to my being blocked. The catch is my texts go to Apple devices but not android devices. However, if I send a picture my texts go through. I'm not a happy customer. 

Thanks for the reply.  I tried all the things you suggested including deleting the contacts and re-entering.  I'm able to send text messages to my other contacts, including to my grandson who has a phone number with the same 630 area code as his father and mother.  The only thing I can think to do is to clear out ALL of the Blocked numbers on my phone but that seems a bit drastic.