Mozilla/5.0 (iPhone; CPU iPhone OS 7_1 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) GSA/184.108.40.206875 Mobile/11D167 Safari/8536.25
What's that "GSA" part?
I've tried to figure it out, but googling wasn't enough (the only meaningful results were about the gsa-crawler, but it doesn't look like it's the case). But for Safari I used to expect something like
Mozilla/5.0 (iPhone; CPU iPhone OS 7_1 like Mac OS X) AppleWebKit/537.51.2 (KHTML, like Gecko) Version/7.0 Mobile/11D167 Safari/9537.53
Of course, I'm giving for granted that it's not a faked string...