It's happening to mine too. Mine is a sumsung S5 active using AT&T. For a few days now. I've even copy and pasted the same message to a few different people and it's inconsistent. people with different phones and operating systems have been seeing my texts that are 2 or 3 sentences long show up as chinese, but not my shorter messages. 3 of the 6 people did NOT receive my text in Chinese. One has a Samsung S5 using Sprint, another has AT&T with an iphone 6 (although the issue was first noticed after sending to husband with AT&T and iPhone6), another has AT&T with Samsung note 4. So operating system, phone, and provider doesn't seem to make much difference.