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Just thought I would update you on my situation in case your phone is still not making calls, and in case my information is any help to you. So, besides posting here, I also emailed them last night. Someone (or a bot) answered in an hour or so, with the following (then what happened with me, below, scroll down):
After reviewing your account, it shows up the service active and the
device should be working properly. In this situation it is recommended
to reprogram your device in order to make sure it is associated to your
account information. In order to do that please follow the steps
provided below, make sure the device is activated to a Wi-Fi network
before you start with the programming:
1. Tap Phone.
2. Tap Key Pad if necessary.
3. Enter ##873283# then tap Call.
4. When Starting Service Update screen appears, tap OK.
5. When Service Update Complete appears, tap OK.
6. The iPhone will reset.
So, I did those things (1-5), but I'm not sure whether #6 should have read "The iPhone IS reset" or "will" meant that I should witness something happening like automatic rebooting or a message bar at the top, saying "resetting" or anything, but none of that happened; after I hit OK the second time, that prompt just disappeared and the screen was still on the dialing keypad, and that was it. I waited a minute or so and tried to make a call; nothing, same old 'call failed' business. I rebooted the phone, still no dice. I even did steps 1-5 again, still no good. By the way, I had also tried the generic iPhone tips I had found from googling (turn airplane mode on, wait a few seconds, turn it back off, make sure call forwarding is off, etc.) but none of those had worked either.
I was getting sick of it and sleepy so I went to bed. When I woke up today, for whatever reason the calling feature simply worked like normal again. I don't know if the #6 step just took hours to work, or if nothing I did made a difference and it was just a network issue. Anyway, I thought I'd share this in case you're still having trouble and haven't been given these instructions to try yet. Good luck!