5s texting error: senders mixed up, texts disappear
Ok, I searched for my issue and couldn't find that it had been covered. My wife and I each have a new 5s, fully updated, through Verizon. We both have our own AppleID on each phone. Her phone has recently begun mixing my texts with her sister's texts.
1) SMS texts from me, if they go through at all, appear on her phone as coming from her sister.
2) Actual texts from her sister (different carrier, not an iPhone) cannot be opened (we're up to 21 of them being indicated).
3) My wife was able to get Siri to READ her sister's actual texts out loud once, but it wasn't easy. Siri kept trying to read my texts (which were the only ones visible).
4) Contact info for everybody is correct and regular phone calls work fine.
5) iMessage between wife and I seems to work ok right now.
6) I cleared and restored her phone using iCloud and it had no effect.
7) To make matters even more confusing, SOMETIMES messages DO come through from her sister, then soon afterwards they completely disappear.
8) Tech at Verizon store was baffled too.
Any advice is greatly appreciated!
iPhone 5s, iOS 8.1.3