Default [Q] Manufacturer blocked phone

I have a galaxy s4 mini and i have been told that it is blocked by the manufacturer. When i put my sim in it, data and reception works fine but i cannot make or receive calls because it says 'Conditional forwarding active'. It is not a problem with the settings i have made sure of this. I just wanted to know if there is any way of being able to use the phone. Will rooting and using cfw work?
Not a professional but good at being a troubleshooter .
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Current Device : HTC Desire HD/Ace
Current Daily ROM : JellyTime_R11

Retired Device : HTC Wildfire S
ROM : PACman v24

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