Solevai uses T-Mobile's cell towers, but doesn't pay advertisers so they can offer the services for less. Similar to Straight Talk (from Walmart) they buy cell space from T-Mobile and advertise using their own means... With Solavei they use us, the customer to spread the news and pass on a discount! Cellular service at a low rate. Bring your own phone, no contract, share with others and get $5 off your bill for each person you share with. www.solavei.com/SkyLo