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NOTE: I'm posting this reply under the assumption that there are still not any LTE toggle apps available for the Skyrocket. If you know otherwise, please advise me-- or just skip my post entirely. Have a wonderful day.
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Just got a Skyrocket yesterday to replace an Infuse. :-$
I don't live in an LTE market, so the corporate AT&T store I bought my device at happened to not have any LTE-friendly SIM cards on hand.
So, I'm still using the HSPA+ card from my Infuse.
Anyway.
Last night, I left my wonderful new Skyrocket connected to my household WiFi - with the mobile data connection still on - after going to bed with it being freshly, fully charged. This morning? I'm no worse off than I had been with the Infuse, which was typically amazing as far as battery life goes. Had over 3/4 battery left when I finally dragged myself outta bed.
Not sure if anyone purchasing this device would be willing to step on their own potential LTE usage by sticking with HSPA+ (which seems to be all over the place now), but I just wanted to let on that such is within the realms of desire and possibility - particularly if you aren't in or near an LTE market.
Getting an Android handset from AT&T that will be supported
at all beyond initial release is extremely vague. I went with Skyrocket over the Galaxy S II because I didn't trust Exynos to play nicely with our domestic radios (Hummingbird-powered Infuse was sketchy at times, particularly in regard to GPS), and because I half-assed expect AT&T to give a damn about it for longer than a minute since LTE is their darling, mewling baby. I'm aware that this may prove to be hubris, and I'm okay with that.
I'll drop in here again soon if it turns out the brand new Skyrocket I just bought does indeed turn out to chew through battery life excessively. But so far, it seems fine.