While everyone else is focused on buying gifts, there's one other type of holiday sale event that you should keep an eye out for: deals from your wireless carrier. T-Mobile Prepaid, for instance, is running a promo that could get you two lines of Unlimited for only $75 per month. Considering that one line usually sets you back $55 per month, the monthly savings here could be immense. And as T-Mobile is more than happy to share, it's 25% cheaper than AT&T Prepaid.

Alternately, if you bring four lines on the 10GB plan, it'll only cost you $100 per month while the holiday promo is live. That shakes out to 25 bucks per line! Plenty of prepaid carriers run special deals this time of year, but it's unusual to find a wireless deal that supports the whole family.

T-Mobile Prepaid's holiday promo

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