T-Mobile Business Unlimited for Tablets plan => Unlimited 5G Data + 10GB of Mobile Hotspot

How to get a Business Account
You can get a business account as a Sole Proprietor using your SSN, or if you have an EIN from the IRS, you can use that.
T-Mobile Business = 877-347-2127 If you're having problems.

Where to get the $15 Plan
Here's a link:https://www.t-mobile.com/business/tablets
You can access this plan by going to the Tablets section on the t-mobile business site. Select a tablet (like the A7 Lite) and you should be presented with the plans shown in the attached picture. If you see a pink banner at the top that says "Get $40 Monthly discount..." you've selected the wrong plan.

Wasn't this $10 before?
Yes, Here's the previous thread for reference: https://slickdeals.net/f/15673165-10-month-t-mobile-unlimited-tablet-line-10

General Info
Data priority info coveragecritic.com/mobile-phone-service/t-mobiles-data-prioritization-and-deprioritization/

How to use for Home Internet
Taken from the wiki on the previous post:
From this post

1. T-Mobile Gateway + Cudy N300 or X6 which are wifi only routers to mask hotspot usage with TTL set on the external wifi router. You can use other wifi routers for this purpose but there's a menu page in the Cudy routers which makes setting TTL easy - Courtesy waterchange
. 1.1 Cudy router like Cudy LT500 or LT18 or the 5G P8 work as a single device with modem + wifi router. Work well for home internet. Nice thing about the Cudy modems is easy TTL (and imei magic if necessary). - Courtesy waterchange
2. M2100 hotspot device - Hit or a miss - native out of the box but less reliable
3. Orbic 5G hotspot device - more reliable than the m2100, however some people have reported throttling after 1st couple of months
4. Gateway + Project Genesis - works most reliably
5. TMOHS1 - ~ 30-50 mbps out of the box, no TTL update required
6. Tmobile Franklin - ~30-50 mbps with TTL update - the most reliable as of right now, however limited speed.
7. M2000 won't pull data from anywhere

Link to this Wiki