Speaking of signal strength, I'm happy to report that even with 0-1 bars in my 4G connection, using the speakeasy.net/speedtest site on two servers rated me at 8mbps down and ~1mbps up.
Holy cow, folks. My 7mbps Qwest modem maxes out at 5.4mbps no matter where I test it (I tried all the servers and about a dozen on speedtest.net).
So signal "strength" and reception doesn't necessarily equate to reduced speeds. I mean, it can and often does, but it doesn't have
to, at least in the form presented on the device's status bar.