Most of the time Iphone 6 ios 8.0.2 cant make calls

=> Iphone6, Model-A1549,
FCC ID BCG-E2816A  IC 579C-E2816A, Dual-core 1.4 GHz Cyclone (ARM v8-based), Memory-128 GB, 1 GB RAM
=> iOS 8.0.2(12A405)
=> Most of the time I CAN'T CALL anybody and call even don't take 3 secs , drops within 3 secs  but i can RECEIVE calls, texts. It will accept in-coming calls but if I try to call out, it immediately goes to "call-ended"I am sure its not carrier problem coz i have tried my sim in other phone to call and it works on other phone in the area.
Troubleshooting steps
Launch the Settings app on your iPhone or iPad running iOS 8.
Tap on General.
Tap on Handoff & Suggested Apps.
Turn the Handoff option Off and then back On again.
Tap General at the top to return to the previous menu.
Tap Settings at the top to return to the previous menu.
Tap on FaceTime.
Turn the iPhone Cellular Calls option Off and then back On again.
Reboot your iPhone or iPad.
Repeat this process with every device you'd like to use.
Try placing a test call to see if the issue is resolved.
Resetting All settings
Resetting Network settings
Holding both the power and home buttons until the device powers off, may take 10sec. Let go of both as soon as screen goes black.

Hey ferozsays,
Thanks for the question. Based on what you stated, it seems like you are not able to make calls on the iPhone. It looks like you have already done some troubleshooting. I would recommend that you read this article, it may be able to help you resolve or isolate the issue.
iPhone: Troubleshooting issues making or receiving calls
Thanks for using Apple Support Communities.
Cheers,
Mario

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