mobile

Hi,

I have a Tab 3 with a data plan from T-mobile. If I root it and upgrade it to KitKat will I loose the data plan? It's one I don't have to pay monthly, it just has a amount of data I can use each month for the life of the device. So please let me know if going to KitKat would stop this data plan. Also, if it wont, please direct me to the best article for doing this.

Thanks