Default Help MetroPcs signal to call, but no internet data!

Hi guys, i need help, i bought a brand new Verizon Galaxy NOte Unlocked to a person he rooted it, i dontt know anything about rooting, i didnt care as long as my cellphone worked. What happened? MetroPCS its supposed to give me not only data also 4G, but im gettin none, i called them and they checked everything so the problem is with my phone, i can make phone calls and everythig except the mms messaging and the internet data. I will appreciate any help please. Also i can say somethin interesting i downloaded some programs to customize themes, wallpapers and several stuff was clicking here and there, and suddenly i got a 4G icon on the cellphone and it lasted, but then i lost it.