The cheapest plan depends on how you use your phone. Seniors who mostly call and text can find talk-and-text or low-data plans starting around $15 to $20 a month. If you use maps, video calls, or email away from home, you will need more data. Watch for two catches. Some low advertised prices require paying for a full year up front, and taxes and fees are often extra. Our roundup of the best cheap phone plans and our guide to the best phone plan for one person compare options. Vouch Mobile’s Premium plan is $30 a month for 10GB, plus fees and taxes, billed monthly with no credit check. Review prepaid vs. postpaid and bring your own phone.