I try to keep my guide as current as possible given the ever-changing nature of ISP’s, equipment, customer’s needs/expectations etc. It is meant as a supplement to AT&T’s Customer Support but is not officially supported by AT&T. It is a rather long document but is a nice reference guide. You can always ask your questions here in the forum and we will try to get back to you as soon as possible. It is difficult at times for us to troubleshoot here in the forum so the more information we have about your setup, ISP, equipment, etc. the easier it is for us to help you. To that end, in addition to the link above, I’ve listed below the types of questions we ask if we don’t have enough information from your original post.
Please run the test and post the results that are listed under the "Advanced" tab.
Are you using the basic connection (modem -> router -> MicroCell) or the alternate connection (modem -> MicroCell -> router)? The alternate connection is not possible with the black (DPH-154) MicroCell.
Are all of the cables firmly in place?
Do you have a combined modem/router (gateway) or a separate modem and router? What are the makes and model numbers for your equipment?
Have you met the minimum requirements for router settings as outlined in the Tech Guide?
What other equipment (access points, switches, computers, WiFi components, gaming consoles, etc.) do you have connected to your network?
What does the light pattern look like on the MicroCell (power, ethernet, GPS, and 3G)? Are they all a solid green or is any of them blinking green or red, and if so, which one?
Have you done a hard reset of the MicroCell? See the Tech Guide for instructions.
Have you deactivated and reactivated your MicroCell using AT&T's MicroCell website?
Test the output voltage of your MicroCell's AC adapter with a voltmeter. It should read 16 VDC +/- 0.5 VDC. Post your results.
*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.