From Newsgroup: comp.mobile.android

UPDATE:

For those interested in the technical details, T-Mobile has retired these particular units earlier in April of this year, but I still have them.
<https://i.postimg.cc/YCKqWQQT/cellularbooster.jpg> cellular booster
<https://i.postimg.cc/vH9xkYhF/cellularfemtocell.jpg> cellular femtocell

I'm told by neighbors that they have a new 4G & 5G unit that they give out. Bear in mind there has to be overlap with your devices for it to work out.

T-Mobile Macro Tower Bands (Local Observed):
Band 2 1900 MHz PCS - Urban LTE
Band 4 1700/2100 MHz AWS - LTE + VoLTE
Band 12 700 MHz - Deep indoor + rural LTE
Band 66 AWS-3
Band 5G NR
Band 5G ER (Bands 12/71)
Band 5G UC (Bands 41/66)

In-Home Free Repeater Supported Bands:
Band 2 1900 MHz PCS - Urban LTE
Band 4 1700/2100 MHz AWS - LTE + VoLTE
Band 12 700 MHz - Deep indoor + rural LTE

In-Home Free Femtocell Supported Bands:
Band 2 1900 MHz - Added via Rev02 firmware (2016)
Band 4 1700/2100 MHz AWS
Band 12 Not supported
Band 66 Not supported

Free Android Phones Supported Bands:
Band 2 1900 MHz - Urban LTE
Band 4 1700/2100 MHz AWS - LTE + VoLTE
Band 12 700 MHz - Indoor + rural LTE
Band 66 AWS-3 - Enhanced mid-band LTE

Band Compatibility Matrix (Overlap Summary):
Band Phone Repeater Femtocell
--------- -------- --------- ----------
Band 2 [Y] [Y] [Y]
Band 4 [Y] [Y] [Y]
Band 12 [Y] [Y] [N]
Band 66 [Y] [N] [N]
5G NR [Y] [N] [N]
5G ER [Y] [N] [N]
5G UC [Y] [N] [N]

Note that the femtocells are limited to 4+4 users at a time.
But the cellular repeaters aren't limited to the user count.

These are my Venn Diagrams where the calculations you run will be different
as they depend upon what cellular towers you have inside your own home.
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From Newsgroup: comp.mobile.android

In article <mer37cFaik8U1@mid.individual.net>, Andy Burns
<usenet@andyburns.uk> scribeth thus

Cameo wrote:

So what do they use in underground metros to enable the use of mobiles?

A leaky feeder, probably more sophisticated these days, but a length of
coax cable with regular notches in the outer conductor.

Its called RADIAX and does just what you have described made by RFS as
below sometimes called a Leaky Feeder!..


https://www.rfsworld.com/searchengine/radiaflex-radiating-cables?p=1
--
Tony Sayer


Man is least himself when he talks in his own person.

Give him a keyboard, and he will reveal himself.


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