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Re: How do you know when you're on 4G
I had my old SIM card in my infuse, and I was getting 6-8Mbps down and 2Mbps up on the H+ network in my area - that's got to be 4G. The best I've seen on 3G was 1.5 or so. My only issue, was that my phone would have a hard time switching from Edge back to H+. So I went to ATT, and asked for a new SIM. The guy there said that I should not have been getting those speeds with my old SIM... Well, I was. I think the new SIM just has newer tower routing information, as I don't seem to have as much of an issue now.
A cool utility that I found, is called "Open Signal". It will tell you what kind of network you're on, as well as the signal strength and tower location. But the funny thing is, it shows "3.5 G" for the 4G HSPA+ network. It will change to "3G" if the signal strength falls below a certain threshold. EDGE is listed as "2.5G".