Contact data will not update properly.
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This is a z10 with OS update 10.3.3.2129. Great phone.
Family has a 2 year long text with 7 others, many happy memories, wish to keep it going. One participant got a new phone number and now doesn't get the text messages. The others still do. If a new text is created using the new number, all get the new messages. But not the old stuff.
I have tried to edit the contact info to replace the old number but can't. "Save" after changing the number pops a message "Invalid account selected (SyncML). Tried several things, including rebooting the phone, nogo so far.
Any ideas? Thanks very much.