(Image credit: Total Wireless / Tom's Guide)

You’re guaranteed some awesome discounts with the best Prime Day deals going on right now, including some generous savings on unlocked phones and accessories. Yet, there’s something else that’s a constant drain for almost everyone: costly cell phone bills that you’re probably overpaying for.With monthly bills for premium postpaid carriers continuing to climb past the $100 mark for a single line, staying connected has become a major expense. Carriers push high-end plans packed with expensive streaming bundles, but I’ve been doing some digging to uncover aggressively priced budget options that deliver excellent coverage.Whether you’re shopping for a single line or looking to cut costs for the entire family, these are the ultra-low-cost unlimited plans they don’t want you to know about.Best hidden cell phone plans: Quick linksBoost Mobile: $10/month unlimited planMint Mobile: $30 for 3-month 6GB planAT&T: $25/month prepaid unlimited planTotal Wireless: $25/month MAX 5G BYO planVerizon: $30/month Simplicity PlanT-Mobile: $100/month 10GB plan for 4 linesThe best Prime Day hidden cell phone plansGet instant access to breaking news, the hottest reviews, great deals and helpful tips.