Dual SIM Data Plan Stacking Calculator
Carriers push a bigger single plan, but nobody runs the numbers on stacking two smaller eSIM plans instead. Enter both options below and see which one actually costs less per gigabyte. Nothing uploaded.
Comparison
| Option | Total cost | Total data | Cost / GB |
|---|---|---|---|
| Stacked (A + B) | - | - | - |
| Single plan (C) | - | - | - |
Verdict
How to compare dual SIM data plans
Why cost per GB is the fairest way to compare plans
Plans come in different sizes at different prices, making side-by-side comparison confusing. The fairest metric is cost per gigabyte - the amount you pay for each GB of data. For example, Plan A costs $15 for 10GB (that's $1.50 per GB), while Plan B costs $25 for 15GB (that's $1.67 per GB). Even though Plan B is larger, Plan A is cheaper on a per-GB basis. Stacking two Plan As would cost $30 for 20GB total (also $1.50/GB). This calculator automatically divides total cost by total data to show you the true unit price for each option." }
When stacking two smaller plans beats one large plan
Carriers sometimes misprice plans such that two smaller ones have a better per-GB cost than one bigger one. Example: Carrier X offers a 3GB plan for $12 and a 10GB plan for $35. Two 3GB plans cost $24 total for 6GB ($4/GB), while the single 10GB plan is $3.50/GB - so the single plan wins. But if the same carrier offers a 3GB plan for $12 and a 10GB plan for $45, now two 3GB plans cost $24 for 6GB ($4/GB) while one 10GB plan costs $4.50/GB - two small plans win. Always run the numbers before you buy." }
FAQ
How do I compare cost per GB between plans?
Divide the total cost by the total data: cost per GB = total cost / total data in GB. For example, a $20 plan with 5GB of data costs $4 per GB. A $30 plan with 20GB costs $1.50 per GB, even though it costs more upfront. This calculator handles the math automatically - enter the prices and data amounts for each plan, and it shows you the cost per GB for both the stacked combo and the single plan side by side.
Why would I stack two smaller plans instead of buying one big plan?
Two smaller plans sometimes offer a better cost per GB than one bigger plan. Many carriers price plans with volume discounts in the wrong direction - you may pay less per gigabyte by buying two 5GB plans at $15 each ($1.50/GB) than one 15GB plan at $40 ($2.67/GB). Stacking also gives you flexibility: if you use only one plan and not the other, you've wasted less money. This calculator shows you which option wins for your actual needs.
Does this calculator check if my phone supports dual SIM?
No. This calculator only compares costs. You will also need to confirm that your phone supports dual SIM (two active phone lines at the same time). Most modern phones do - check your phone's specs or manual. You'll also need your carrier to support eSIM activation, which most major carriers do. This calculator assumes you already have a compatible phone and focuses only on pricing.