It's a long shot, but is anybody using an unlocked T-Mobile 7105t on AT&T? I was wondering about the Browser in particular because this model was released specifically for T-Mobile. Before I buy an unlock code from Horizon Wireless (I'm no longer a T-Mobile customer) I wanted to be sure it would work.

Dang, it should. I believe the only difference was the 7105 was hearing aid enabled or something of that sort. It is still GSM = GSM.

Someone else might recall differently, although I am 90% sure...

I agree, but I'm more worries that AT&T won't have compatible service books. I remember using an original 8300 with T-Mobile before they released it themselves. We had to use the OS from British carrier O2 and several of us needed new SIM cards as well. But with the 7105t there aren't any other options for an OS other than what TMO provided.

I used an unlocked 7105t on AT&T for at least 18 months and it worked absolutely fine. No problems at all.

Well the main difference on the 7105t was the improved screen. It wasn't so hard to read in direct sunlight.

I absolutely fell in love with the screen on the 7105t when I saw it in a store. I bought it on the spot and fiddled with it the entire way home. Coming from a 7230 and 7730, this new screen blew me away! I've never really gotten over that fascination with the 7105t, even though it's outdated and underpowered. I still want to use mine from time to time. I've asked T-Mobile for an unlock code and failing that I will simply buy one from Horizon Wireless.

I think the 7105t has the same screen as the 7130g

When I first saw the 7105t I was using the old 7730, what I thought was a big jump up from the 7230. Bigger screen, better backlight. Then I saw the 7105t, the SureType keyboard, and I couldn't sleep! The next day I was back at a local cell phone shop getting hooded up with the 7105t.

I've asked T-Mobile for the unlock code three times and haven't even gotten the courtesy of a response from them. I do still have 2 lines with T-Mo, both kids' mobiles, so it's not like I'm a stranger to them. I even have one of the kids' phones set as the 7105t on the MyTMobile web site. Now I'm waiting on Horizon Wireless for the unlock code, and then I fire it up with AT&T! Boo-Yah!

I finally got my trusty old 7105t unlocked. I deleted the T-Mobile service books, logged into the AT&T BIS page on my home computer to change devices by entering the 7105t's PIN and IMEI, and sent my service books. Boom! Up and running immediately, just like it should. Full functionality. Of course the 7105t never did MMS due to the lack of a camera, but it does everything else. No html email due to the OS being so old: 4.1.0.377

I'm totally loving the nostalgia factor here. SureType takes some getting used to again, but it's fun for now. And I have my precious thumb wheel back, which I have missed dearly.

I have two alternate wallpaper pics saved, MaraTick for shopping list, Google Maps, and Berry 411 Search installed, and that's it. This thing is as stock as can be. I have a whopping 10.6 MB of free memory upon reboot and it's generally fast and smooth operating.

I'm practically Michael Clayton here!
(5 points to anyone who gets that reference)