Below are the supported carriers:
(updated 04/29/2011)

ACS (Alaska)
Alltel
Appalachian Wireless
AT&T
Bell Mobility (Canada)
Blue Mtn Wireless - CC Comm
Bluegrass Cellular
Boost Mobile
Carolina West
Cbeyond
Cellcom
Cellular One
Cellular One (Bermuda)
Cellular South
Centennial Wireless
Chat Mobility
Cincinnati Bell
Consumer Cellular
Corr Wireless
Cricket Wireless
Digitel (Alaska)
Dobson Cellular
DTC Wireless
Fido (Canada)
GCI (Alaska)
Illinois Valley Cellular
iWireless (IA-IL)
IWireless (Ohio)
Koodo (Canada)
Long Lines
Metro PCS
Mid-Tex Cellular
MTS Mobility (Canada)
Nex Tech Wireless
Nextel
nTelos
OpenMobile PR
Pioneer Cellular
Pocket Wireless
Qwest
Rogers (Canada)
Simmetry
Southern LINC
Sprint
SunCom
T-Mobile
Telus (Canada)
Thumb Cellular
Unicel
United Wireless
US Cellular
Verizon (including legacy Alltel customers)
Viaero
Virgin Mobile
Virgin Mobile (Canada)
West Central Wireless

We released Twitter integration last night. And, we've kept it simple.

First time you sign in (after the release), you'll need to click a link to take you to a Twitter Authorization page. You enter your Twitter credentials.

Then, whenever you are sending a message and you want the messages posted to Twitter, just check the box "Post to Twitter too?".

When you hit send, your contacts will get their text message and the post will go to Twitter.

Hope you like it. Please contact our support team if you have any questions (support@txtsignal.com).

So with several of the changes that we have recently made, we wanted to start the blog fresh.

For the balance of this year, we're working on some exciting tools and delivering some accompanying tools (some of which we'll be releasing really soon).

Anyway, for the time being, all posts will be new. We're going to be porting over the historical posts over the coming weeks.

As always, if there is anything that you need, please contact us (support@txtsignal.com).

Matt