Its my general understanding that all tri-band does is give you 2 extra frequencies... That being said... I have no problems running CM11 on L720T I can get sms messages and make phone calls I do not have any issues with anything else wifi or bluetooth other then crashing when using IR functions. My data is nice and fast....
I would like to start developing a rom for L720T to take advantage of spark tri-band its just hard at the moment with the limited user base... More people seem to develop more for the variants of S4 but not the T sniff sniff.....
If there are other developers with this phone that wants to put the brain power together I am down to make it happen...
GVOICE SMS - 14847069412
*If you send me dumb messages I will ignore you looking for serious developers not noobs with 50 questions.
Phone: Samsung Galaxy S4 (L720T) (Black)
Recovery: CWM 6.X
ROM: CM11 Nightly [jflte] Branch
Phone: Motorola Droid X (Black)
Recovery: CWM 2.5
ROM: CM9 Nightly
Phone: HTC Dream G1 (Black)