For one line, most seniors can expect to pay about $20 to $40 a month for a plan that fits everyday use. If you pay more than $60 for a single line, you may be paying for data or perks you do not use. Start with your real usage. Check your cellular data for the last three months, then compare it with our guide on how much data you need. Always compare the full price, including taxes and fees. Our guides to the average phone bill in the US and how much a phone bill costs show typical ranges. Vouch Mobile’s Premium plan is $30 a month for 10GB, plus fees and taxes, and WiFi calling is supported on compatible devices.