It appears that another T-Mobile "Line On Us" for existing customers is coming this Friday. No word on the duration of the promo. Voice lines only.
It also allegedly stacks with the prior free lines. I'll update with any cheap/free phone deals that may be available...
Link to Megathread (will be updated when/if T-Mobile posts a promo page): https://www.reddit.com/r/tmobile/...r_account/
Eligible rate plan SOCs (OCR'ed -- apologies for typos):
Look up your SOC code (pasted from prior deal thread -- can't create a Wiki for some reason):
How do I look up my SOC code?
If you want to know what your SOC code is, login using a web browser so you are looking at your account. Be sure to enable "Web Console". (FireFox --> Menu --> Web Developer --> Web Console) Pop over to the Network tab and look for an XHR request to "Subscriber".
you'll see your SOC Code in the Response section. For example, here is the relevant section:
"name": "Simple Choice North America 10GB Family Match Promo",
You need to be on the "home" URL when you enable the tools. I've attached a screenshot that shows (circles) all of the areas you should be at or click to ensure you can see the SOC Code. Sorry if this is too complicated - just trying to share info.
(Credit: /u/double-xor on Reddit)
For your plan code view in Chrome:
Then go to the main T-Mobile account homepage (the magenta square with white T in the upper left…or refresh it if already there).
In the Java window, single-tap Subscriber (or type it in the Filter search tab if you can't find it, then single-tap Subscriber)
Tap Response tab (if not already selected). In that long string, you will find the plan and socCode.