Re: MICROCELL --- AFTER ACTIVATION ALL ARE GREEN LIGHT EXCEPT THE 3G IS RED FLASHING
As you've discovered, AT&T MicroCell Support is clueless and useless, most of the time. A flashing red 3G light either means there is a hardware failure or an update by AT&T didn't properly reset the MicroCell and it thinks there is a malfunction. If the 3G light flashes green, that could be a GPS problem. Make sure you're setup properly, modem -> router -> MicroCell, an unobstructed view of the sky (about 18" from a window), and no other WiFi device is within about 2' of the MicroCell. No PPoE connection and plenty of steady speed from your provider. I'd then power cycle everything again, wait for about 5 minutes, and power up. Hopefully all the lights will go green. If the 3G blinks green, you may have to wait up to a couple of hours for sync to take place. If it is still blinking red, then you'll probably have to call AT&T back again and get an approval for warranty replacement. Carefully document your calls to support so when you go down to your local AT&T store then can verify with support your replacement. Most AT&T stores won't be able to help you at all with the MicroCell unless they can verify with support your connection problems. You also may want to try priority setup, modem -> MicroCell -> router. Support will probably have you try that as troubleshooting (it takes the router out of the config) so I'd do that before you call.
*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.