WELCOME to ANDROID FORUMS GUEYDEJALISCO!
I've been w/SPRINT for 6 months,coming from prepaid w/CRICKET,& wish I had made the switch long ago.
Lots of upside to SPRINT vs. VIRGIN MOBILE.
1) Better selection of phones,namely the PHOTON.
2) Unlimited 3G/4G data without throttling.
I used to be strongly opposed to obligating to a contract service,but,you're paying a monthly phone bill w/or w/o a contract,so,what's the difference,right?
To sum things up,if you're in a 4G WIMAX coverage area,I strongly recommend getting the PHOTON.Look at the coverage map very carefully where you'll be using 4G WIMAX beforehand.If 4G WIMAX doesn't extend greatly to your area,or,if you don't have 4G WIMAX coverage at all,you may be better advised to get one of the upcoming 4G LTE phones.(GALAXY NEXUS LTE,EVO 4G LTE).