*** UPDATE -- free AAL ends COB Thursday, 9/24! ***
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...
https://www.reddit.com/r/tmobile/...in_on_918/
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):
10BFM2L
10BFM4L
10FMBZ2L
10FMBZ4L
10FMSC2
10FMSC4
10SCFM2L
10SCFM4L
1PLSALL
1PLSALL9
6BFM2L
6BFM2LN
6BFM4L
6FAMBZ2L
6FAMSC2
6FMBZ2L
6FMBZ4L
6FMSC2
6FMSC4
6SCFM2L
6SCFM2LN
6SCFM4L
FRLTUL4LP
FRLTULF2
FRLTULFM2
FRLTULFM9
FUL8PRDOM
FUTTVN
FUTTVN8
FZLTUL4LP
FZLTULF2
FZLTULFM9
LTULFM2
LTUNLFM9
MAGENTA2
MAGENTA9
MAGPR2TI
MGPLSFM
MGPLSFM9
NAFUTT
NAFUTT2
NAFUTT2P
NAFUTT4
NAUTTF
PFRLTULF2
PFZLTULF2
PRFT5SC
PRFTL8SC
PRLUTTVF
PRSCFUBD
SCFUTT4
SCFUTT6
SCFUTTBD
TIUL4L
TIULFM9
TIUNL2
TIUNL9
TM1PR2
TM1TI2
TM1TI9
TMESNTL2
UBFM2L
UBFM4L
USCFM2L
USCFM4L
Z1PLSALL
Z1PLSALL9
ZBPUNL2
ZBPUNL9
ZBUNL2
ZBUNL9
ZLTULFM2
ZLTUNLFM9
ZMAGENTA2
ZMAGENTA9
ZMAGPR2TI
ZMGPLS
ZMGPLS9
ZNATTU2
ZTITUL4LP
ZTIULFM9
ZTM1PR2
ZTM1TE2
ZTM1TE9
ZTM1TI2
ZTM1TI9
ZTMESNTL2
ZTMONE9 [redd.it]
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:
````
{
"ratePlan": {
"name": "Simple Choice North America 10GB Family Match Promo",
"planType": "SIMPLECHOICE",
"socCode": "10SFM2LN"
}
}
````
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.
https://imgur.com/LSM3ayP
(Credit: /u/double-xor on Reddit)
For your plan code view in Chrome:
View>Developer>JavaScript Console. Then tap Network tab then XHR tab.
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.
https://www.t-mobile.com/ 
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What is the order in which I have to do all of this? Do I need to do this in-store? Can I use the type 3 code within a day or two after everything else is done?
Thanks.
I was sent to a store to do this by the 'group or representatives' that are supposed to be a small group who know your account and details....the store's FIRST reaction was to change my plan...
The second reaction at the store was to change my plan, they just wouldn't stop...then finally they read the details and saw that I did not need to change my plan.
I think they have an add a line promo when the iPhone 12 arrives and get everyone for yet another line. So I may hold off...
https://www.reddit.com/r/tmobile/...ine_promo/
Costco is offering a $100 Costco Shop card when you BYOD and add a new line to any T-Mobile plan - even legacy plans. The offer stacks with other offers (and even stacked with the free line promo for at least a few days).
Also - $0 SIM fee and $0 support fee, so you'll only pay the monthly line charge when adding - no extra fees.
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