I pay about $30 a month for Google Fi. Unlimited calling and text, they charge you based on how much data you use that month, so it fluctuates. They use whatever the strongest signal is at the time from Sprint, T-mobile, and US Wireless. Plus it also uses Wifi for calling. Had it almost a year now, very pleased. They also offer financing for a phone if you need one. Currently the Nexus 5X is about $199 and works with their plan. You own the phone forever then, no contracts.