Not at all. Your download speeds won't be as fast but it will run fine on 3G.
what i want to know is can i use this phone on att's network... i tried using an att atrix on tmobiles network, and it worked, but i forgot about the different frequencies and was stuck with 2g speeds.
tmobile coverage is SO bad tho, i would really liketo know if a tmobile phone will get 4g on att (essentially the reverse of what i tried before)
as far as the phone itself, heres a review after spending 6 months hacking and rooting and basically abusing it in every conceivable way possible
tmobile speeds suck. the best i get on the mobile 4g/H+ net is between 2-4 megabits/sec. and thats only if i have a perfect signal. the ping times to towers have obscene lag times, and when they throttle yer data they dont just slow u down, they knock your speed down to 35 kb/s , essentially makin the phone unusable. the bigger problem is, tmobile reception is as bad as ever, maybe even worse. and i have had problems in two major metropolitan areas get anything more the 2g data speeds, and that is when i hava a signal at all, my phone drops cell service constantly.
the phone itself is superb tho. super fast, great battery life if you keep the screen bimmed, its not so big like the galaxy 2 and 3, and xda-developers has great roms for it. i recommend the pacman rom (cyanogen10/aokp mixed rom) , super easy to root , and i luv that you can take the micro sdcard out from a port on the side, instead of having to remove the battery cover.
its light weight, but not too light weight, and the backing has a textured, sorta rubber feel that makes it easier to hold compared to something like the atrix.
as far as i know there is no tv-out thru the usb port (even using one of those usb to hdmi adapters) but i could be mistaken. the internal storage SUCKS, it says 4 gigs, but its split in two, and effectively becomes a little under 1.5 gigs twice (half for internal storage, half for the fake internal "sdcard"
the 32 GB external sdcard is nice, but u have to fiddle with it to get the phone to treat it as its internal "sdcard". ntfs support and/or encrypted external sdcard also require a custom rom, so if you need file or encrypted file containers bigger then 4 gigs, you will need to deal with that as well.
it is do-able tho. eds-lite app is compatable with truecrypt on a pc, which is great, and ntfs mounting can be achieved a number of ways, the paragon app is the one that works best on 4.1.2
also, it is possible to get flashplayer working on the browser, just use the one for ICS and the 4.2 gapps work good too, especially the new swype enabled keyboard.
this is all regarding a cyanogen based rom tho, if you stick with the stock touchwiz/samsung rom, 4.0.4 is the highest upgrade i believe, with is not nearly as capable. plus you are limited to mass storage mode for usb connectivity, versus cm10's media transfer capabilities, (similar to htc sync) which allows you to connect by usb without un-mounting the sdcard on the phone.
ALSO:
it does have gorrilla glass
the power and volumes buttons are on the wrong sides,(power on the right, volume on the left, and this is INCREDIBLY annoying) the person who thought to do that should be fired. its THAT much of a nuisance.
it has wifi-n, but only 2,4 ghz, no 5 ghz, but the wifi does work pretty good and is as fast as any laptop. easily getting upwrds of 10 mb/s download on wifi
the accesories for it are seriously lacking, i still cant find a decent case with a kickstand for it, the galaxy s3 is completely overshadowing it, but considering the s3 is practically twice the size, i guess overshadowing the blaze is to be expected, lol. (at least the blaze fits in my pocket)
in case anyone wants to know more check the galaxy blaze section on xda-developers.com