T-Mobile’s add-a-line promotion has been in full swing since February 13th, but they just posted a brief 15 second marketing spot reminding you it’s going on. The promotion lasts till March 23rd and offers $0 Value and $5 Classic add-a-line offers. The promotion offers a $5 savings each month until January 2nd of next year.

From our earlier post: Existing customers can take advantage of this opportunity by switching to the Classic or Value family promo rate plan, which does come with a contract extension however. The $5/$0 add-a-line offer is available on shared limited bucket family plans and the 500 minute add-a-line option for unlimited family plans. Unfortunately, according to the above image, unlimited add-a-lines are not eligible for a discount. In other words, the primary line can have unlimited minutes, but the second-fifth lines are not eligible for a discount if they choose unlimited minutes. The good news is that they will qualify if they opt for the 500 minute add-a-line option.

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