A familiar T-Mobile deal is making the rounds again

– Bwayan, Reddit, September 2025

And even if you do snag the offer, it’s not “free-free.” Taxes still apply, the line won’t qualify for a free phone or upgrade, and if you drop a paid line within a year, your free one could either disappear or turn into a paid line.

Still, recently, we found that T-Mobile subscribers don’t really care what free lines might cost them but as always, the fine print is where the real story hides, so make sure to read it all before agreeing to anything. You can avoid bad surprises down the road if you do.

A free line can still be a big deal

The main perk is obvious – your monthly bill gets lighter. For families or groups of friends sharing a plan, that can mean real savings. On top of that, the extra line can be used however you want: a spare number for work, a slot for a tablet or smartwatch, or just more data to spread across devices.

And from T-Mobile’s perspective, it’s smart business. By adding more lines per account, it makes customers less likely to switch carriers. Once multiple people are tied into the same plan, inertia usually keeps them locked in.

A great offer for some

At the end of the day, this isn’t T-Mobile being overly generous – it’s a retention strategy. Still, if you’re eligible and don’t mind the fine print, it’s a solid way to save money or get more flexibility out of your plan.

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Rediscover some of the most unique and memorable phones of the last two decades! “Iconic Phones” is a beautifully illustrated book that we’ve been working on for over a year – and it’s coming out in just a couple short month!