Phone Plan Comparison Calculator
Choosing a cell phone plan is harder than it should be. Carriers price plans in confusing ways, bundle features you may not need, and frequently run promotions that change the value proposition. The clearest way to compare two plans is to look at the total 2-year cost of ownership, which is how most carriers structure device financing. This comparison should include monthly service cost multiplied by 24 months, plus the cost of a typical phone upgrade. A mid-range flagship device costs around $800 on average. With that total figure, you can also calculate cost per gigabyte of data per line, which reveals how efficiently each plan delivers data. A plan with twice the data for slightly more money may be the better value. This calculator accepts the monthly cost, data allowance in gigabytes, and number of lines for two plans, then computes monthly difference, annual difference, 2-year total for each plan (including a $800 phone), and cost per GB per line.
2-year savings: -- with --
Plan A
Plan B
| Metric | Plan A | Plan B |
|---|---|---|
| Monthly total | -- | -- |
| Annual total | -- | -- |
| 2-year total incl. phone | -- | -- |
| Cost per GB per line | -- | -- |
How to compare phone plans
Monthly advertised prices are rarely the whole story. Carriers often apply autopay discounts, require a trade-in, or bundle streaming services that may or may not be useful to you. The most reliable comparison method is total cost of ownership over the standard contract window, which for most device financing plans is 24 months.
Cost per gigabyte is a useful secondary metric. If Plan A offers 50 GB for $45 per month and Plan B offers 100 GB for $55 per month, Plan B costs $0.55 per GB versus $0.90 for Plan A, making Plan B better value per unit of data even though its monthly fee is higher. For families, check per-line cost on multi-line plans: a four-line plan at $120 per month ($30 per line) often beats four individual plans at $45 each.
Coverage quality varies significantly by location. A cheaper plan on a network with weak coverage in your area will cost you more in practice through dropped calls, slow speeds, and frustration.
Phone plan comparison: frequently asked questions
Should I include the phone cost in a plan comparison?
Yes. Many carriers subsidise phone cost through the plan rather than discounting it up front. Always compare total 2-year cost of ownership, including device financing or purchase cost, to make an accurate apples-to-apples comparison.
What is a good cost per GB?
In 2024, competitive plans deliver data at $1 to $5 per GB per line. Unlimited plans are harder to evaluate on a per-GB basis but offer price certainty and are usually better value for heavy data users.
Do unlimited plans really offer unlimited data?
Most unlimited plans throttle (deprioritise) speeds after a threshold, commonly 50 to 100 GB per month. Check the carrier's terms for the full-speed data cap before committing.
Should I compare per-line or total plan cost?
Both matter. Per-line cost tells you whether the plan is competitive individually; total plan cost tells you what you actually pay. Multi-line family plans often reduce per-line cost significantly.
What else should I compare besides price?
Network coverage in your specific area matters most. Check the carrier's coverage map for your home, workplace, and frequent travel routes. Hotspot allowance, international roaming, and customer service ratings are also worth comparing.
References
- FCC Broadband Data Collection and annual Mobile Competition reports: fcc.gov
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. Plan pricing changes frequently; verify current rates directly with each carrier before making a decision. See our methodology.