I can't imagine why I'd need to ask my SO's PIN or she'd need to ask mine - I actually would, as you say, probably give it without even thinking about it; but if you have a healthy relationship then noone feels any need to check the other's phone/email/diary/whatever.
My wife and I have each others' unlock codes because sometimes we get info from each others' phones for one another. "Hey hon, I've got my hands full, can you see if Jane replied to my text yet?" or "Can I use your phone to look up X? Mine's about to die."
We don't feel any particular need to check up on each others' communications, though. It's just a practical matter for us.
I have no unlock code, tbh. But my GF does, and I know her key. She told the key like 2000 times, but I forget it :D
Plot twist: her PIN is "2000".
I can imagine lots of reasons to use my partner's phone.
"Your dad sent a text, want me to read it to you while you're washing dishes? I know your mom's in the hospital."
"Mind if I use your phone to call our friends and tell them we're running late? I left mine at home and you're driving."
"Is it OK if I use your phone to put on some music? It's already paired with the reciever."
And so on. Checking a partner's phone doesn't have to include spying. Sometimes it's just the most convenient thing to do.
Ok, there can be valid uses. But they haven't happened in my 9 years together with my SO. Probably depends on the habits - I don't call/SMS that much anyway; I know her ATM card code, as we needed that some times, but I've got no idea about her phone/other passwords.
For me it is most about healthy habits: never ever give your password to anyone.
Anyone? How come?
Re:Apple Unveils The iPhone 5S
by Wingman4l7 on Tuesday September 10, 2013 @10:49PM
(#6365195)
How about a series of emails joking & griping about your wife's habits to your best friend? Completely harmless but not exactly the kind of thing that you'd want them reading.
Our digital selves trail back in time farther and farther these days; would you want your wife reading emails between you and an ex from before you met her?
If you're married and your SO can't just ask you for your PIN code - and you will, without even thinking about it, give it to them - you might want to take some time to think hard about your relationship.