I don't use the phone but the same happened on my laptop. Can't remember exactly when but within the past 10 days. Also, around about the same time, both my computers did a hop, skip and jump to Yahoo. Have neveer used it and don't want to. I could access virtually nothing unless Yahoo wanted me to. Engineer came along and managed to fix it. He could not explain why, unless it was a hack.
Fortunately, he brought back my old laptop, into which he had put a new hard drive. This works. My other machine switched back to Yahoo two days ago. (Have not yet tested the desktop).
Have the aliens landed?!!!