[n00neimp0rtant]

I HIGHLY doubt the GPS has anything to do with cellular. I was able to use GPS with no SIM with my 3G tethered to my 2G.

[kjack05]

my blue dot doesnt work on AT&T, not sure what the issue is

[NookaDooka]

Did your GPS work once? Is it just crap now, showing wrong locations, not moving at all? Is your wifi signal weak or dropping all together? I had this problem after dropping my phone at a friends after one to many beers. I didn't notice that night but best believe that next morning I knew something was up when I was right at my desk (at home) next to my wireless router and I kept getting either weak signals or none at all! I figured that it was just low speed so I shrugged it off and went to work. Well when I opened the maps app my GPS was all screwy! What I mean by this is that it wasn't doing **** for me! It kept locating me in an unknown spot and the little blue dot wasn't pulsing. Not only that it didn't track any of my movements. Then I knew the drop the night before had something to do with it. Still skeptical about any hardware issues I searched the internet high and low for answers but found the same thing over and over. reset network settings and go outside, find open area with no trees... yadda yadda bla bla bla!! That's all fine and dandy if you're having a GPS update issues but not for I and a whole lot of others! So I researched how to open this bad boy (iphone 3g) and take a look inside thinking that it may be hardware issues and low-N-behold... yesir!! here's what i did...


First learn the correct way to open a 3g (suction cup) without breaking anything. Just google it.
Next once you open it up notice that there are little orange stickers with numbers on them. YES apple was nice enough to label some stuff for us though I have no clue what the hell any of them are, but rest a-sure they are numbered.
Now look at the top left corner, there should be a little round labeled piece numbered 6. I pressed until it snapped back into place and closed and fired her back up... and BINGO there's my pulsating blue dot.
When I connected to my network here at home it was stronger than ever!
I REPEAT the little round piece labeled 6 at the top left corner was lose so I just snapped it back into place and every thing was good once again! Try it out but be careful opening your 3g the front is attached to the rear piece. GOOD LUCK!
<------- that's me now!!!

[RDL]

If I was brave enough to take apart my phone I would try the above. I rarely use Maps or apps that require it to locate me but lately when I do I notice my GPS is poor. It worked great on my 2G but not so much on my 3G. Sucks cause its out of warranty. I havent dropped it. Sometimes it works sometimes it doesn't. I read tons of ppl claim 3.0 started this GPS problem and honestly I think it might have. I dont think its TMobile or my phone but the firmware.

[mooselander]

Originally Posted by stlcaddie

To tell you the truth, the iphone 3g gps doesn't work for sh^t. so thats probably why your having a problem. Im att and the gps on my iphone really is just a laughing joke. So im sure apple threw out a bone for us dogs before the bone was cured and ready to chew on. Feel me ?

My 3G GPS works quite well actually. I'm on the T-Mobile $5.99 data plan and I have zero complaints, I use it all the time.

[LrdBane]

The 3G models have a "better" gps functionality because they actually do have the actual hardware for GPS. However does not really work all that well. You have to literally be outside with no clouds in the sky and holding your phone up on top of the empire state building kind of thing. Ok may be a little stretch but it does have a tiny antenna. But it IS there. Most of the time it will use both the cell towers and the GPS antenna to get your fix. You will get the ring when it has a good guess vs the solid dot when it pretty much knows where you are. With all that's crammed in to the phone there are going to be some problems vs a actual dedicated GPS unit. Should not matter if you are on a 3G, Edge, GRPS or WiFi. The only thing that you need data for is the maps and thats where its going to slow everything. If you are jailbroken I would suggest you get the maps enhancer from Cydia. It will keep the cache of maps you view beyond what Apple set for a cache. Then you don't have to worry about reloading the maps as much.

I have my trusty ole 3.99 tzones unlimited plan and have very few problems and i'm on a 2G iPhone