Q: Change "Trust Computer" setting

Go to Settings → General → Reset and select Reset All Settings. You won't lose any data with this selection and will be able to select authorize when you connect the phone again.

According to Apple's document, http://support.apple.com/kb/HT5868, if you choose "Do Not Trust," the next time you plug in your device to that computer, it'll ask you again to choose "Trust" or "Do Not Trust." If you choose "Trust," the computer is trusted indefinitely.

-David

The Apple document says, "Note: If you select Trust, the computer will be trusted indefinitely. If you select Don't Trust, you will be asked if you want to trust that computer each time you connect your device to that computer."

It aint so. I have to Trust my windoze based computer everytime I plug in my iPhone or my iPad.

worked just fine, thanks

Do you have the computer set to accept cookies? Do you delete your browser history and cookies? When you do that, it will clear that information and you would have to trust it again. I've not experienced the behavior you describe on either of my Windows computers, both running Windows 7, iPhone 4S with iOS 7.0.2.

not working like that for me - asks everythime and I always say TRUST - just using computer for charging, not iTunes

Same here on my mac running 10.8.5

OK, so if I click TRUST COMPUTER it's on there indefinitely. So what if I get rid of the PC, then what?

It's really not a security risk because you'll no longer need to attach your phone to that PC. And since your phone can "trust" more than one computer, you'll also trust your new PC. Make sense?

OK, I saw something the few days ago that said something about a limit of 5 computers. Well I have 2 computers that were trusted with one operating system, they both have been ugraded, and so now have been trusted again with the new OS system. Both computers are falling apart and really need to be replaced, but I am an unemployed Disabled veteran who is unable to work because of my service connected disability. So right now I can't afford to get a new laptop and desktop. But if my luck ever changes I would like to, so that will then be more than the 5 I read about the other day. So what do I do then?

Apple iOS Team/Developers should add (or  patch this with) the option to remove or reset Trusted Computers.

I'm sure it's in a .plist.  Hence why jailbreak comes in handy.  Here's what I found and one can see Trusted Computers.

Settings → General → iTunes Wi-Fi Sync

• List (Trusted computer)

You can't left swipe to remove the computer(s) or when you select the computer listed; yet no option to remove it there either.  (It seems silly not to have this option.  If you're think up various scenarios why you'd need to reset/remove Trusted computers.  The computer also remembers which iOS Devices has given trust privilges.  I couldn't find the .plist in the OS X.  If I find it I will update this post accordingly).

So doing Reset all settings isn't in the best interes to the user, unless you want to.

Don't do this:

• Settings → General → Reset and select Reset All Settings

Wait for Apple to fix this or petition for it.

Links that are relative to this feature.

1. http://www.macobserver.com/tmo/article/x-new-and-hidden-settings-in-ios-7
2. Developer talk in github about trust pairing >>
   https://github.com/libimobiledevice/libimobiledevice/issues/20

If itunes is not installed then it will ask you every time if you trust that computer, but if you have itunes installed on your computer then it will be like what apple says: http://support.apple.com/kb/HT5868

In this article, Apple says, "Note: If you select Trust, the computer will be trusted indefinitely. If you select Don't Trust, you will be asked if you want to trust that computer each time you connect your device to that computer."

Not so with my desk top windoze box. Everytime I sync my phone, I have to select the Trust button - still. I do have the most recent version of iTunes. I'm guessing the windoze box isn't smart enough to remember the phone.

see this article:

http://support.apple.com/kb/TS5335

It may hopefully help you figure out the problem.