Should I say something?

Saturday night I went and had a girls night and stayed at one of my good friends house for the night while my boyfriend was having his night out. Sunday I get home and we’re waiting for the ball to drop But he fell asleep. Once I noticed he was asleep I grabbed a phone, we have the exact same iPhone 6s phone with no case so I didn’t know which one I was grabbing. It ended up being his but I was going to text our parents happy new year anyway so I didn’t really think it would be bad do to that on his phone. But whenever I opened the phone and double clicked the home button all the previous pages showed up so I scrolled through to find the message one and I found he was looking up porn(which is alright with me) but I also found that he looked up one of those sex calling numbers while I was gone. I did go through the recent calls and I didn’t see the number. But I don’t wanna start a fight or does it even really matter? Do those numbers really work? Should I ask him what he was doing looking it up and if he did it?