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Changed the radio, APN settings, kernel and ROM but no luck ! What should i do?
True, but the N4 does have a working LTE radio and the older .33 radio with the CM 10.1 rom will give you LTE if your in a t mobile lte covered area or in one of the other carriers lte area that use the band 4 lte.Are you on hspa or 3g? As stated the rom and kernel have zero to do with tour data speed. If your on att they don't use hspa+42 so your speeds will be ehhh. If your on tmobile you could very well be in an edge area and are on 2g. Or your in a 3g or hspa+21 area only. Again those would make your speeds ehhh. Your data speed are completely carrier and location based related. No rom can make you have lte speeds if you have a non lte phone. Don't work that way.

Sorry about the off topic posting, what carrier do you have?Should I call my operators support? I don't use T-Mobile also I don't use LTE either.