Sprint is hoping to attract customers to its network with a combined promotion that includes the Samsung Galaxy S6 and a Sprint Unlimited Plus service plan for $80 per month. The plan includes the 32GB GS6 for "free" after a $20-per-month credit with a 24-month lease; unlimited talk, text, and data; international value roaming; and annual upgrades. Customers who want the 64GB or 128GB models can get them for $85 and $90 per month, respectively, with the same service plan. Families interested in the Galaxy S6 can score four of them with unlimited talk and text, and 20GB of shared data for a total monthly price of $200 per month. Annual upgrades would cost another $10 per line per month. Customers looking for the Galaxy S6 Edge can snag one for $85 per month ($5 per month after $20-per-month lease credit) with the Sprint Unlimited plan. Customers not interested in contracts or leases can pay full price for the Galaxy S6 ($649.99) and pair it with a Boost Mobile plan. The Galaxy S6 and S6 Edge go on sale in Sprint stores April 10, with pre-orders beginning March 27.