hi ..I can't make a phone call or send a text on my iPhone 4s ? It was working fine this morning but now erecting I make a call it says call failed ..I can receive calls and text an use the Internet fine ,,what could this be ?
On the iPhone hold down the Sleep/Wake Button and Home button together until the Apple Logo shows. Then On seeing this Apple Logo release both buttons ,and the iPhone will reset , which has been known to clear most glitches.
Other options are :
Settings -> General -> Reset -> Reset Network Settings.
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