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I have an iPhone 5 which I purchased (from India) in Nov 2012 and now it is out of warranty. I found an old SIM Card, which I purchased from Singapore when I was visiting that country, and put it inside my phone just to check if it still works or not.

I asked my friends to call me on that number, they could hear the phone ringing tone but my phone was not ringing so after that I switched back to my local SIM which was working before. Now I am unable to make any calls from my number, all outgoing calls fail immediately with a "Call Failed" message and I can hear 2 beeps. I can receive Incoming calls, send and receive texts and can browse the internet using 3G data connection on the same SIM.

I tried the my local SIM in other phone and it works perfectly fine which confirms that there's no issue with the service provider. I Tried some other local SIM in my iPhone 5, that doesn't work either.

This is definitely some issue with my iPhone 5. What could the issue be? I am really worried because it is out of warranty now.

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    I saw a similar problem here but doesn't seem to help :( – Anuj Rajput Oct 27 '14 at 11:16
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Another solution I found to this problem:

Open Settings -> Phone -> Show Caller ID

It'll take some seconds to load the and show a loading indicator, after that is done the phone will be able to make and receive calls

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I found that the problem for call failed on my iPhone 6 was the bad date & time settings. My location-based timezone was not enabled, and the phone time was incorrect. I disabled the auto time & date, reinserted the sim card and BOOM!

I got the dots. It works.

Source: http://www.unlockboot.com/2015/10/fix-call-failed-iphone-6-plus-6-6s-6s.html

  • is any of them a permanent fix? The caller ID and *#31# are temporary fixes, the phone restarts and it again does the same behaviour – Anuj Rajput Nov 6 '15 at 4:29
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I tried

Settings -> General -> Date & Time -> Set Automatically Turn it OFF

I set the Time Zone manually to the local time zone and set the time back to when I bout the phone in November 2012. After that I just changed the time to the current time.

After that I found out the Location Privacy Setting for updating the time zone was disabled in the Settings -> Privacy -> Location Services -> System Services -> Setting Time Zone. This must have happened when I switched my SIM Card. I turned it on and now IT'S WORKING :D

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