You shouldn't trust anything completely. All you can do is manage your risk to the best of your ability and be aware that unless you are talking to someone on

You shouldn't trust anything completely. All you can do is manage your risk to the best of your ability and be aware that unless you are talking to someone on top of a mountain and neither one of you have a phone with you, everything you communicate, digitally or otherwise, is very likely being recorded or logged somewhere by someone.