Help 4G, 3G no-G only E? skyrocket

[Sunny99]

so i just got this Skyrocket.. Love the phone.. absolutly. but have a question
I got it from a mobile store that sells used phones and boost and pagers plus...
it is an AT&T phone.. been unlocked.. but i'm with Simple Mobile.
So I dont know how to keep the 3G or 4G on all the time.. most of the times I only see the E withthe 2 little arrows under it..
Is there a place I can go to have that set up-turned on ?

any help would be greatly apprciated.. thanks

 

[miclo]

you have to switch to a different providor simple mobile doesnt support that phone ive tried it, i suggest going to straigh talk