I am sure the women in this thread who have done this were always delightful, surprising, adorable, and charming when they reached for that laddie's phone. I would expect nothing less from LHCF.
Having said that, I find it deeply obnoxious to see either women or men do this to people's phones. There were no cell phones when I was in middle school, but I observe tweens today, and this strikes me as something very middle-schoolish. There is something childish in the pretend coyness of it, the tittering, the flashing of cheeky grins as though to say "this is my way of flirting with you, and aren't I so cute you can't get mad at me?"
Uh, yes, I sure can get mad at you for grabbing what's not yours and using it as an excuse to check my business and insinuate yourself in my life before i've granted you that opportunity.
I hate it when both men and women have done this to me, both with platonic and romantic ends in mind. I didn't feel flattered, I felt irritated that they had the temerity to grab my phone, scroll through my address book, possibly check my text messages, and programme themselves into my life without me inviting them in.