When I got my Galaxy S3, it worked well. After about 18 days, it started dropping calls. Every half hour or so. I researched, saw a bunch of people were having this problem, and I followed their advice and downloaded a signal booster app. Took care of the problem for about 2 weeks. Yesterday I downloaded the update, and now I can't talk more than one minute before calls drop. My phone is useless. I'm so sick of it.