Instruct: Classify a given review into positive or negative sentiment.
Query: The worst phone I've had

I have bad signal or non at all in places where I used to have signal all the time. A co-worker had the same problem and told her to return before 30 days(wish I had) - Can't change the screen menu. The camera button goes off all the time (badly situated). Not a good ringtone listed. Battery marker will have 3 bars and then none. Can't wait to change it!