A few weeks ago my 2 years old iPhone 5 refused to make outgoing voice calls. I suspected it was the shitty Indonesian operator as per usual so I had it checked to Telkomsel.
Not sure if this is related, but whenever I restart the phone, I see this “Sending Message”:
We tried placing my SIM card in another phone and it worked fine.
So we came into conclusion that it was either the iOS or the iPhone. Then I tried restoring everything to factory settings and everything but nothing worked.
I wasn’t entirely sure what happened, because I can receive incoming calls and the data worked fine. So bizarre. Then I stumbled upon this support thread here.
Someone was suggesting I try dialing *#31#. When I tried it, this message popped up.
And after dismissing that, I was able to make phone calls. As it turns out, that command actually meant “Show caller ID” and mine was permanently stuck at “Do not show caller ID” for some reasons.
Unfortunately this is not a permanent solution, as sometimes the problem still occurs and I have to dial *#31# again everytime.
So if your Telkomsel number cannot make outgoing calls, try this tip and let me know if it works for you too!