Happened to me once. WG I saw three weeks before sent out an alert to all the guys numbers she had in her phone and almost got me caught.
It was Sunday morning, mid summer so the sun was shining and I was relaxed a bit too relaxed usually I didn't leve my phone laying around but who expects a dumb WG to send a text out at 10.30am on a sunday morning? Anyway Mrs 3000 goes, you just got a text do you want your phone? I say yes and she unlocks it as she brings it to me and starts reading it to me, she goes hey it's talking about prices for sex. I was mortified and acted shocked and baffled. And say it must be a wrong number etc
Didn't want to overdo it so I vowed to get to the bottom of it. She goes off to have a bath and I wrack my brain for an idea. I get one. I knew that you could send yourself a text from certain websites. I also knew that the Mrs knew me and my work mates like to play pretty sick but believable jokes to embarrass each other.
So I sent myself another text with the same kind of language as the one from the WG but slightly sillier. 5 mins later it arrives to my phone and I tell my Mrs as she sits in the bath. Then as she's getting out I send one supposedly from a mate saying that he hoped he had gotten me in trouble.
The Mrs seemed to buy it, and I could enjoy the rest of my sunday.
Last time I ever left my phone unlocked though..