I sent an SMS and my contact received only part of the message I sent, to which some text I sent to another contact, a few months ago, was appended. I have proof it happened twice, but here is what it looks like:
September : I send ContactA a message: "AAA AAA"
- On my phone : "AAA AAA"
- On ContactA phone: "AAA AAA"
- On ContactB phone: [Nothing] (As you would expect)
December : I send ContactB a message: "BBB BBB"
- On my phone : "BBB BBB"
- On ContactA phone: [Nothing] (As you would expect)
- On ContactB phone: "BBB AAA AAA"
I checked with my carrier, and he told me that he saw that the text I sent ContactB was 11 characters long (it was actually way longer than that, but I ajusted the number to fit the example.)
The first time I got a proof it happened, I was using GO SMS, so I uninstalled it, and it happened again a day after using the default (Hangout) application.
I think this is a really serious problem since it violates my privacy with ContactA by revealing some conversation to ContactB.
Devise / OS Version : Nexus 5 / 5.0