How to Find an iPhone’s Phone Number
Whether you just got a new phone number, changed a number from an old one, or you happened upon someone else’s iPhone and want to know the number of who it belongs to, you can easily retrieve an iPhone’s associated mobile number. The obvious solution might be to call another phone, but if the device has no service or the service has been disconnected, don’t despair. There are two super simple ways to find the number on the device itself – even if the phone no longer has any service and no sim card – but you can also get it from iTunes and sometimes even on the sim card itself.
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You can change the default alert times of calendar events on iPhone and iPad. 
Anyone who takes a lot of screenshots in Mac OS X knows the challenges associated with them; how quickly their desktop will fill up with various PNG files, sorting those into folders or just tossing them elsewhere, converting the screenshots to a different image format, copying them to the clipboard for pasting into another app, cropping down to size, or whatever else is required before the screen captures are in their final usable format.



A little-known screen flashing feature exists in Mac OS X that provides an alternative way of being notified of system alerts, meaning that anytime you’d typically hear the general system sound effect feedback, see a bouncing Dock icon, or have a new icon badge appear, the screen will briefly flash instead. The screen flash alert is silent but offers unmistakable feedback that an alert has occurred, and can be used in conjunction with the standard alert sounds too.
Ever wanted to create a reminder on the iPhone that is on a unique repeating interval? Maybe of alternating days, like a reminder every other day, or a reminder every 3 days? Oddly, this option isn’t available natively in the Calendar or Reminders apps of iOS, but these custom repeat reminder options do exist on the iPhone and iPad, you just have to use Siri to create them.
The iPad can play a variety of video formats without any additional apps or tools, and the bundled Videos app is more than sufficient to play a variety of very common movie file types including mp4, m4v, mov, and mkv. If you have such a movie on a computer that you want to watch on the iPad, you’ll need to follow a fairly simple process to copy it over, but nonetheless it’s not always so straight forward to users who are new to the platform.
One feature the iPhone Camera app badly needs natively is a self-timer, which allows you to set a time delay, say 10 seconds, before the camera shoots a picture. This lets you as the photographer be able to set the camera up somewhere, set the timer, then walk on over to be in the frame of their own shot. It’s a widely used and essential camera option for taking group photos of family and friends when there isn’t another individual around to take the picture, and in the age of posting everything to Facebook and Instagram, a lot of people just use it to shoot “selfies” too. The self timer feature is so widely used and so standard on every other digital camera out there that it’s actually quite surprisingly Apple hasn’t included it in the iOS cameras yet.