msg code 2300

So frustrating T-Mobile can’t get on their own thread and share the solution after 3 years of people asking how to fix.  
 

here is the fix:

login to T-Mobile online acct or mobile app. 
 

select your device, device details

Scroll down to section ‘additional task’ and select ‘all account settings’

Select block calls and messages

Select your phone (if multiple phones on acct)

Make sure you are not blocking chargeable messages/content.
 

Now you can send a regular text and get charged for it. I iPhone and android user can text each other