Sprint USB aircard no Internet

tek9

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I'm having trouble getting my Dad's Sprint aircard to work. Background as follows:
He had an AT&T PC card broadband modem which worked for years but was getting slow lately and causing BSODs recently when it was plugged in at startup. He was paying around $90/mo for it. Since he has his cell phone service with Sprint, I advised him to just add on an aircard from Sprint to his plan which will come out cheaper, plus he'll be getting a newer modem, which should work faster, better etc., and it'll only be like an add'l $50/mo or so. He did so.
Now the Sprint modem is a USB plug in model. He followed the instructions (close applications, insert modem, done) and it worked once. After that, he can't access the Internet.
I logged in to his laptop (Dell Precision Win 7) via Teamviewer (so obviously the Internet IS working). I checked the Network and Sharing Center, and it shows Intenet access is fine. He has a good IP and all other settings.
I opened IE and it can't access any webpages. It just says "opening www.xxxxxxxxxx.com" etc. I reset IE settings, and it worked again for one time, but not after that, even if I'd reset it again.
I flushed the DNS cache. I pinged google.com, and others, and they all came back fine, so it doesn't seem to be a DNS issue. I even changed the DNS to 8.8.8.8 and to OpenDNS servers.
I transferred over the Chrome installer via Teamviewer and installed it, thinking it was an IE issue, but it still doesn't work. Interesting thing is, that the built-in Chrome webpages (Docs, Drive, Calendar) do work, and when I log in to my Google account, I can access my gmail and search, but it doesn't go further than that.
I disabled his AV and firewall (ESET) and no change. His ESET was outdated so I sent him the small downloader file, and it managed to download the newest version and install it. Rebooted and no change.
Any ideas of what I should try next?
 
So, it sounds like networking works, but you have no, or limited, http functionality with the new device. Did you uninstall any software (driver, etc) that might have been used by the previous ATT modem? I would check that first. Then I would try removing and re-installing the new device after I was sure that any remnants of the previous modem have been removed.
 
How does the machine behave if it's pluged into an ethernet connection or wifi?

I'll be getting the machine on Sunday to check Ethernet connectivity and everything else. Too complicated to teach him what to do over the phone.
 
So, it sounds like networking works, but you have no, or limited, http functionality with the new device. Did you uninstall any software (driver, etc) that might have been used by the previous ATT modem? I would check that first. Then I would try removing and re-installing the new device after I was sure that any remnants of the previous modem have been removed.

I uninstalled the AT&T connection manager software.
I will see on Sunday, when I get the laptop, regarding reinstalling the new modem.
 
Update

Update:
It seems that the AT&T modem had installed a "3G connection" in the Network Connections. I deleted that and the Sprint USB modem works fine, albeit slowly.
Ethernet connection works fine, too.
Only thing is that the Sprint modem only had a 3G connection available in my area, but it was really s-l-o-w. The guy at the sprint store said to disable 4G LTE on the modem, so it'll only use 3G, and it worked faster at that point. Don't know why.
Thanks for all the suggestions.
 
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