I am having a lot of problems with my O2 company 3G Internet modem dongle. Only used on a desktop for rural Internet access - no hard wired service. It always works on GPRS (dial up). I have an average signal for 3G and sometimes get 1.5Meg download speeds.
However it also often will not connect to 3G at all. Error 619.(cannot connect with distant computer)
When I speak to the helpdesk. They have a set routine they work through. Try it somewhere else in the county, what version of software are you using, clear cookies, force it to select 3G only as you haven't a very strong signal. Always after getting through to the Tecnico in the end and being forced to restart my PC it "magically" works. Once they even admitted there was a "limiter on the line".
I took the modem to an O2 shop on Friday for testing as they suggested and the first shop didn't have a computer to plug it into and the second did but couldn't test as (unusually apparently) the antenna serving our area was down.
Now the questions.
Do SIMs go faulty?
Do the modem dongles go faulty (Alcatel x220D)?
Is it possible that I have some sort of gremlin associated with my SIM/mobile number perhaps at their end?
What would a UK service provider do in a similar situation.? Here the onus(being Spain) is always on the customer to do something !
Error 619, from memory is a local fault, ie before you connect, most likely to be Sim related, assuming Sim is live for the Network your using, could be Sim contacts either on the Sim or the Dongle, also worth checking you have Data Roaming switched off, could be the Dongles trying to log on another Network.
Forcing it to 3g only when you have a crap signal will only make things worse, if you have a Signal Issue then the Dongle needs to near a window and higher.
In my experience USB Dongles are touch and go, compared to the old PCMIA and Card types, they sometimes hang the comm ports and even pulling them in and out a few times, end up needing a Hard Re Boot. They can overheat when used with a Net / Noteboock.
The O2 desktop software ins't that good either, can sometimes be a resource hog, try down loading the Dongles own Global Software and try that, normally a lot cleaner to run.
Or you can trying connecting directly using Windows, the Dongle would have made a Modem Icon in your Modems Folder called O2 something, click on that, No User or Password is required, Dial Up number should be in there already, something like *99*#, assuming you dont have the O2 Software running, if that works better for you use that and change in Properties>>Options>> and tick redial if line dropped and changed redial attempts from 0 to 10, then it will auto redial if Signal is dropped.
Personally I gave up using Dongles, and Bluetooth Tethering isn't much better, if I need to use mobile I use an old HSDPA Symbian Phone up as high as possible and close to a window and connect to it using WiFi, (additional cheap Software required) or already there with Android, works a treat and can stay connected for days.
Chris.