If the Chinese symbols translate to hahahaha...must be a funny test. Seems like nothing to worry about
I can only imagine how many users in the USA panicked at this and called their carriers reporting they were being hacked. American's are really paranoid and think every little thing is a hacker getting into their phones and stealing their info.
poor souls don't know Apple and Google already do that with their approval.
1. The twitter person is silly. Receive junk YET PRESS. Lack of education.
2. OnePlus now maybe under the eye of US security.. prepare to get banned.
The chinese characters stand for "hahahahahah".... sure someone was a little bit too drunk or lacking some sleep :D