5 bars of micro cell signal strenth but call quality is still very poor

Poor call quality, especially when the MicroCell indicates connectivity (solid green 3G light) and phone connectivity (5 bars of M-Cell strength) is usally a line quality issue which is your ISP.

A dual band router has nothing to do really with the MicroCell because you are conneting to the MicroCell's antenna's not the router's.

Basic questions first. How do you have the Microcell setup, is it a new MicroCell, and who is your ISP. We have a more extensive list of questions but let's start with those first.

Dual band routers (2.4 GHz/5GHz) allow for handling 802.11 standards a/b/g/n/ac.

2.4 GHz handles 802.11 b/g/n

5.0 GHz handles 802.11 a/n/ac

The frequency that the wireless part of the router operates on is independent of the Mcell as the Mcell is connected via Ethernet cable.

The OP's description of the problem indicates to me that there is a line quality issue.  Have you tested your connection for VoIP quality (http://www.voipqualitytest.com/)? Please run the test and post the results that are listed under the "Advanced" tab.

Dual band routers (2.4 GHz/5GHz) allow for handling 802.11 standards a/b/g/n/ac.

2.4 GHz handles 802.11 b/g/n

5.0 GHz handles 802.11 a/n/ac

The frequency that the wireless part of the router operates on is independent of the Mcell as the Mcell is connected via Ethernet cable.

The OP's description of the problem indicates to me that there is a line quality issue.  Go to http://www.voipqualitytest.com/ and run the test.  Post the results that are under the "Advanced" tab.  Sounds like a packet loss issue to me.

* The Micro Cell is direct connected to the router via Ethernet cable

* Its about 7 years old

* ISP is Time Warner Cable

Speed test statistics
---------------------
Download speed: 7587 kbps
Upload speed: 1233 kbps
Download consistency of service: 78 %
Upload consistency of service: 39 %
Download test type: socket
Upload test type: socket
Maximum TCP delay: 89 ms
Average download pause: 4 ms
Minimum round trip time to server: 38 ms
Average round trip time to server: 49 ms
Estimated download bandwidth: 41572 kbps
Route concurrency: 5.4793696
Download TCP forced idle: 75 %
Maximum route speed: 13796 kbps

VoIP test statistics
--------------------
Jitter: you --> server: 8.0 ms
Jitter: server --> you: 4.1 ms
Packet loss: you --> server: 0.0 %
Packet loss: server --> you: 5.5 %
Packet discards: 1.0 %
Packets out of order: 0.0 %
Estimated MOS score: 1.0

What is your subscribed bandwidth from Time Warner (ie. download/upload speeds)?

Your VOIP line quality test validates what I initially suspected.  Your line quality is most likely the cause of your problem.  The jitter values are high which indicates a significant variability in packet delivery, your packet loss is also unacceptably high as well as your packet discards.  Your MOS score of 1.0 should be 4.2 for a good line quality score.

Unfortunately, your problem is in Time Warner's court.  There's nothing AT&T can do about your ISP's line quality.  I would advise you to contact TW's tech support and have them send a tech to your house to test the line quality with their test equipment.  Hopefully, they can determine what the problem is.

Agree. TWC is more than likely the problem. Good luck.

No signal no service dropped calls.  At&t is the worst.  If I sold someone a sevice and didn't deliver that would be theft.  So at&t are thieves, right?

@AblowsTblows123 - you've posted the same post in two different threads. It's best to keep your posts to one thread so others can follow.

Without detailing your issue it's impossible for us to help you. So if you want help you'll need to help us with details.

Do keep in mind that sales of the MicroCell were discontinued at the end of 2017. AT&T will continue to support it (what ever that means) but WiFi-C (WiFi Calling) is what AT&T, and us are recommending now if your phone is capable. The service itself will be discontinued sometime in the future. My guess is by the end of this year. Your only other options are to purchase a cellular booster (see my Cellular Booster Guide, link in my sig line), switch carriers, or possibly try Google Voice.