HT1430 I cannot do calls from my Iphone 5

It is strange what happens to me with my Iphobe 5.
I travel to another locality and can do calls but later I cannot do any more, already I have restarted and restored it and nothing.
The problem is this, because the telephone navigates in Internet with the mobile network and with network WiFi, receipt calls, sending and I receive messages but with it of the salient calls not that happens.
I placed my SIM in another Iphone and it works perfectly, also place another SIM who is not mine and the same thing happens with the Iphone, I cannot do calls.
Thank you.

Settings > General > Reset > Reset Network Settings.
If that does not resolve, basic troubleshooting from the User's Guide is reset, restart, restore (first from backup then as new).  Try each of these in order  until the issue is resolved.

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