Scenario: contact group ABC contains 3 contacts, A, B and C. I regularly text the group, and it works fine. One day, contact A gets a new phone and a new SIM. As is my habit, I retain A's old number for a while, just in case, and add the new number to A's contact record and mark it as the default number.
From this point, if I phone contact A, it uses the new number. Fine.
But now, whenever I text contact group ABC, it still sends to A's old number. Not fine.
I have searched for any information or fixes but drew a blank.
This is a Samsung Galaxy Ace 4 btw.