Can't make outgoing calls. Baseband issue? - Optimus One, P500, V Q&A, Help & Troubleshooting

Hi, a friend gave me an old LG P500 phone to play around with. It had a stock ROM on it.
I put my SIM in, phone showed I have service but when I try to make calls it won't let me. It just disconnects in less than a second.
So I flashed a custom rom (GSNAP 1.5) to check if that might fix the issue. It didn't, exact same issue.
Phone shows it's connected to my service provider, DATA actually works but can't make outgoing calls.
Any speculations or help?
Thanks!

can you receive calls? if no then probably hardware issue.

Its network issue.. your phone is okay!!
Call network customer care!!

Well I didn't check if I can receive calls...
I don't really care that much as to call my customer service to get it to work. I have a working phone.
This is a friend's phone and he wanted me to get it working.
I guess I'll let him try it with his SIM card. Maybe his will work.
By the way, could it be that the phone might be network locked but it just doesn't say that for some reason?

Tried a different SIM card, didn't solve the issue. Same problem.
I'm not sure it's a service provider issue.

may try flashing the official rom using kdz . might be some issue with the libraries.

I flashed the official V20c with KDZ... Still a similar problem but now it shows a message when trying to make an outgoing call: "Divert Activated"

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[Q] Can't make calls or SMS - hardware or software??

My Desire S won’t make or receive phone calls or texts. My first thought was the radio, so I upgraded to ICS using the standard downloaded RUU, which includes a radio update. The problem is still there so its not radio related.
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The phone fully crashes and needs a reboot
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[URGENT] Suddenly can't make calls from Nexus 5

The problem started last night when i was travelling, it was working in my previous city, but as soon i got the signals on the airport in next city, calls suddenly stopped working. It ends with "Call ended" as soon as i try to dial a number. I can send SMS, receive calls, but can't make any calls.
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Might be an apn problem, I mean if it works in DU.
My hometown is Fortuna California.
Now that I am back in my city, as soon as I got the signals on the airport, calls started working again. ?
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I can't make any normal call, but full network coverage, and internet 4G normal

Hi,
I have not been using my OP6 because of a strange issue with it since OOS 10.3.9 (maybe since May 2021)
This issue is: I can not make nor receive normal call with any provider. but my network bar is full and my 4G internet is running smoothly.
If I try to make a call, it just show the call screen, no calling tone and no waiting tone and the other phone doesn't ring.
If I try to call my OP6 from other phones, it just doesn't connect, no call tone no waiting tone... My OP6 also doesn't show any incoming call.
I'm sure my sim cards are OK, I have tried to put them in a different phone and they can make normal call.
If my sim card slots were broken, I would not have any coverage and my 4G wouldn't work...
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anybody can help me?
thank you
I had the same issue, at the end oneplus said, bring it to a service center while there plenty or forum posts in their forums from technician saying it's the network chip, i got a new phone but will attempt to replace that chip once i got my replacement.
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