I unlocked my phone but now I can't send texts to certain networks.
Basically I have a lot of friends in Oman and since I unlocked the phone it won't text the 'Nawras' provider at all but it works with other providers in that country
When I try to text it charges me but the person I'm sending to does not receive it
My phone is a Samsung d900i

Does anyone have any ideas on what could be wrong with it or any settings that I should change?

Help would be so much appreciated as it's driving me mad!

Thank you!!

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