Log in to sync Facebook with your other applications

Following message regularly appears in Samsung Galaxy Notifications:

Facebook
Log in to sync Facebook with your other applications

When you tap on the message it opens a page with Facebook logo asking you to login into Facebook or create a new account. This is rather misleading as this message and page has nothing to do with Facebook app. It is actually coming from SNS (Social Networking Service) app that is pre-installed on Galaxy phones that Samsung uses it to sync social network information with some other apps.

An application has been forced to stop for an unauthorized attempt

Samsung Galaxy Note 3 with Android 4.3. Occasionally following message appears in Notifications:

Prevention information
An application has been forced to stop for an unauthorized attempt to access system in your device. It may be safe to delete an application obtained from an unauthorized route

iPhone - very high data usage (email stuck in outbox)

A user managed to hit O2 1GB data usage limit on iPhone 5 in two days! He was normally using under 100MB per month and could swear that he hadn't done anything unusual in these 2 days.

After checking that backups and updates over cellular were disabled and there were no suspicious apps running, I added additional data package and reset iPhone data counter. In couple of hours I checked the iPhone again and to my surprise it had already uploaded over 40MB of data over cellular network.

iPhone stuck on Apple logo

iPhone stuck in an infinite reboot cycle: starts, gets to the screen with Apple logo and spinning circle, then after a few minutes reboots again.

Phone was fixed by putting it into a recovery mode and doing a restore via iTunes. Be aware that this resets the phone to factory defaults which deletes all apps and data from the iPhone. This also updates iOS to the latest version so if you had a jailbroken phone it will restored to factory iOS version.