T-Mobile Business 5G Internet costs $70 a month for one line. No contract. No installer visit. You plug in a small gray box, and you have internet in about ten minutes.
That is the pitch. It is mostly true. But mostly true is not the same as right for you.
We have helped clients turn it on, turn it off, and use it as a backup line. Here is what we actually see in the field.
What you get for $70
One line, unlimited data, a gateway they mail you. Download speeds run 100 to 400 Mbps in most markets. Upload is the catch. Real uploads land between 10 and 40 Mbps. On a bad day, less.
Compare that to Comcast Business at 500 Mbps down and 35 up for around $180 a month. T-Mobile wins on price. Comcast wins on consistency.
If you do video calls all day, upload matters more than download. This is where 5G starts to wobble. A Zoom call with four people on it needs a stable 3 to 5 Mbps up per person. T-Mobile can hit that. It just does not hit it every hour of every day.
Where it works
Small offices with two to five people. Retail counters. Pop-up locations. Job sites. Any place where the internet needs to work, does not need to be perfect, and you do not want to sign a three year contract.
We put it in a real estate office in Tampa last October. Six agents, mostly on their phones. Old provider was AT&T at $145 a month for 300 Mbps. T-Mobile cut them to $70. They have not called us about it since. That is the sign it is working.
We also put it in a law firm. Different story. Two attorneys, one paralegal, all on Teams calls. It lasted six weeks. Uploads dropped mid-call twice a day. They went back to fiber.
Where it does not work
Anywhere the tower is more than a mile away or blocked by a hill or a tall building. T-Mobile checks your address before they sell it to you, but the check is not perfect. About one in four of the addresses we run come back "eligible" and then perform below what the sales page promises.
It also does not work well for:
- Offices that run a phone system on the same connection (VoIP hates jitter, and 5G has jitter)
- Warehouses with metal roofs (signal cannot get in)
- Anything that needs a static IP (T-Mobile does not offer one on this plan)
- Point of sale systems that require PCI compliance with a wired connection
The fine print people miss
Speed is not guaranteed. Read the terms. T-Mobile says "typical" speeds, not "minimum" speeds. If you get 40 Mbps down at 2pm on a Tuesday, that is within their terms. You have no recourse.
Also, the $70 price needs a voice line on the same account. If you do not have T-Mobile phones, the price is closer to $85. Still cheap. Just not the sticker price.
And the gateway is theirs. If you cancel, you send it back. Lose it, and they charge you $370.
How to use it smart
The best use we see is as a backup line. Primary internet is fiber or cable. T-Mobile sits behind a failover router. When the main line dies, the office keeps working. At $70 a month, that is cheap insurance.
The second best use is single-location small offices where the alternative is $150 to $200 a month for cable. If the T-Mobile signal at your address is strong, you save real money.
The worst use is a large office trying to save on a fiber bill. You will save for two months and then spend a Saturday putting fiber back in.
Should you try it?
If you are paying more than $120 a month for cable and you have five or fewer people, run your address on T-Mobile's site. If it says eligible, order it. Keep your old service for 30 days. Test it during your busiest hours. If it holds, cancel the old line. If it does not, send the gateway back.
That is the whole play. Not complicated.
Not sure what your current bill should look like? Upload it and we will tell you in about a day.
Related reading
→ Comcast Business vs T-Mobile: which is cheaper for a small office → How to read your T-Mobile Business bill → When 5G fixed wireless makes sense as a backup line → What a fair internet bill looks like in 2026