Start by setting a hard total budget that includes the phone plus two years of service. The average US household spends $1,254 per year on mobile phone service (BLS Consumer Expenditure Survey, 2024); adding a premium phone can push that near $2,000 annually. Plan first, then pick the phone that fits.
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Start by calculating your total cost of ownership (TCO) over at least two years. The average US household spent $1,254 on mobile phone service in 2024, according to the Bureau of Labor Statistics Consumer Expenditure Survey. If you add a premium phone that retails for $1,000–$1,200, your two-year TCO jumps to roughly $3,500–$4,000. A budget phone (under $300) paired with a prepaid plan can bring that under $2,000. Decide what you can afford monthly and annually, then work backward.
Use this simple rule: your monthly plan payment plus any device installment should not exceed 5% of your after-tax income. For example, if you take home $4,000 per month, aim for a combined bill of $200 or less.
Understand Plan Costs: Prepaid vs. Postpaid
The biggest cost difference is between prepaid and postpaid. Prepaid plans typically cost $25–$45 per month for unlimited talk, text, and data (with some throttling after 20–30GB). Postpaid plans from major carriers run $60–$90 per month for comparable service. Over two years, that’s a savings of $300–$600 with prepaid. However, postpaid plans often include perks like streaming subscriptions or hotspot data that can offset the price if you value them.
| Cost Type | Prepaid (Budget Provider) | Postpaid (Major Carrier) |
|---|---|---|
| Monthly plan (unlimited) | $25–$45 | $60–$90 |
| Phone financing | Usually not offered | 0% for 24–36 months |
| 2-year service total | $600–$1,080 | $1,440–$2,160 |
| Device lock-in period | Often no contract | Until phone is paid off |
Source: FCC Consumer Advisory on Mobile Plans (2025) and industry averages.
Check Phone-Plan Compatibility and Lock-In
Not every phone works on every network. Major carriers use different 5G bands; a device sold by one carrier may not support all frequencies on another. Before buying, verify that the phone’s model number supports the bands used by your chosen plan. The FCC’s unlocking rule (effective 2024) requires carriers to unlock devices after 60 days of service, but phone financing agreements can effectively lock you in for 24–36 months. If you want to switch carriers mid-contract, you may owe the remaining balance.
- Buy an unlocked phone directly from the manufacturer (pay full price) to keep switching freedom.
- If you finance through a carrier, understand the early termination or payoff policy.
- Check the phone’s compatibility using the FCC’s Device Certification database or your carrier’s BYOD tool.
Compare Trade-In and Upgrade Value
Major carriers often offer trade-in credits of $400–$1,000 for older phones, but those credits are usually spread over 24–36 months. If you cancel early, you lose the remaining credits. Prepaid providers rarely offer trade-in programs. A better strategy: sell your old phone independently (sites like Swappa or eBay) for a lump sum, then use that cash to buy an unlocked device. According to the Consumer Technology Association, the average resale value of a flagship phone after two years is about 40–50% of its original price.
Factor in Hidden Fees and Taxes
Your monthly bill often includes more than the plan price. The Tax Foundation reports that wireless taxes, fees, and surcharges add an average of 18–25% to a postpaid plan in the US. Prepaid plans are taxed at lower rates (typically 5–10%). Common fees include: Universal Service Fund (USF) charges, regulatory fees, 911 fees, and state/local sales tax. When comparing plans, always ask for the “all-in” monthly price including taxes and fees. A plan advertised at $60 may actually cost $72–$75.