I searched Forum first, honest… After a FP2 Factory Reset, I restored contacts - but test texts don’t go, message comes up “Error 21” with ‘Sending disabled’ 
I seem to have options to choose ‘Messenger’ for SMS texts or go for the SMS default, neither seemed to work ??? 
but, but - even dumb phones send texts… This is silly
What would the handbook say?
Just to rule out something went wrong with restoring the contacts (number format or else) … Did you try to enter a phone number manually and send a text to it?
Edit since you factory-resetted anyway and are able to restore 
: Googling the error suggests you could try dialing *#*#4636#*#* … Test menu appears (nice, didn’t know that) … first item (sorry, german phone here, something like “phone information” I guess) … scroll down to “SMSC:” … refresh that.
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Thanks oh wise Elk! Tried that - it refused because messaging wasn’t on the default… Do I want to restore the default? Yay. Got rid of messenger for Android - and it worked! Text received.
The ##4636## didn’t get a test menu - Just rang off.
This may be a ‘solved’ (though I still don’t know what Error 21 is…)
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