Problems with galaxy s5 network

Hello guys! long time lurker, first time poster here.

I have a galaxy s5

recently the phone acted extremely weird when i first used it. So i flashed the phone and re-installed the android software which fixed all the weird problems i was having.

Now im still having 1 problem. with my SIM card installed i have full network (5 bars) when i try to make a phone call i get a "not registered on network" error. I remove my SIM card, the network is still present (5 bars)

I seem to have full signal at all times with or without my SIM card. The phone does not acknowledge the SIM when i put the SIM card in or when i remove it.

Did i do something wrong when i flashed my phone? i installed the same stock ROM that was on the phone with the proper carrier (videotron)

I need your help!
Thank you in advance.

i forgot to mention that the phone is rooted. If i could somehow figure out how to reset the carrier settings i think it might help.

hyelton said:

have you tried going into settings, Mobile Networks, and then Network search? and let it sit and pick your own network? do you have another active sim you could maybe try?

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Thanks for the reply.
I've tried selecting my own network manually serveral times with 2 different SIM cards.. It didn't change anything. I still have full service without a SIM card.