MetroPCS launched a new promo that gets you 4 lines for $100 with unlimited data. Also, you get free phones if you switch from other carriers (Excludes phone numbers currently active on the T-Mobile network). They have some good phones like Galaxy J7 Prime.
MetroPCS is a T-Mobile subsidiary and uses T-Mobile network.
https://www.metropcs.co
Notes:
From the website: "Promotional Rate Plan Offer: Requires activation of at least one new line of MetroPCS service. Offer not valid in IN. One line is $50, 2 lines are $80, 3 lines are $90, 4 lines are $100, with each line receiving unlimited data at up to LTE speeds on handset . If new line deactivates, all lines on account lose promotional price. Not eligible for further family plan discount. LTE connectivity requires capable device. Not available for more than five (5) lines per household/account. Combinable with select features. "