Mobile data is the internet your smartphone uses when not on Wi-Fi. It is measured in megabytes (MB) and gigabytes (GB). In 2026, the average US household spends about $114 per month on cellular service, with data costs varying widely by plan type and carrier.
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Compare Plans →Free to compare · No credit check to browse · Affiliate-supportedWhat Is Mobile Data?
Mobile data is the internet connectivity you use on your smartphone, tablet, or mobile hotspot when you are not connected to a Wi-Fi network. It allows you to browse the web, stream video, send messages, use apps, and check email. Every time you open a map, scroll social media, or watch a short video clip, you are using mobile data. The amount of data you consume is measured in megabytes (MB) and gigabytes (GB). According to the FCC, the typical US smartphone user consumed about 12 GB per month in 2025, and that figure continues to rise as streaming and video calls become more common.
How Mobile Data Is Measured
Mobile data usage is measured in bytes. One kilobyte (KB) is about 1,000 bytes, one megabyte (MB) is about 1,000 KB, and one gigabyte (GB) is about 1,000 MB. A typical web page might use 2–5 MB, a minute of streaming music uses about 1–2 MB, and a standard-definition video uses roughly 1 GB per hour. High-definition video can use 3 GB per hour or more. Carriers track your usage in real time, and most plans either cap your data at a set limit or throttle speeds after a certain threshold. The table below shows common data activities and their approximate consumption.
| Activity | Data Used (approx.) |
|---|---|
| Loading a webpage | 2–5 MB |
| Streaming music (1 minute) | 1–2 MB |
| Streaming video (SD, 1 hour) | 1 GB |
| Streaming video (HD, 1 hour) | 3 GB |
| Video call (1 hour) | 0.5–1.5 GB |
Mobile Data Costs in 2026
The cost of mobile data varies significantly depending on whether you choose a prepaid or postpaid plan. According to the Consumer Expenditure Survey from the Bureau of Labor Statistics, the average US household spent $114 per month on cellular phone service in 2025. Breaking that down per gigabyte, prepaid plans typically cost about $1.50 per GB, while postpaid plans average around $3.00 per GB. Unlimited data plans have become the norm, with about 68% of subscribers on such plans, but many include deprioritization or throttling after a set amount of high-speed data. Overage fees, once common, have largely disappeared, replaced by automatic top-ups or speed reductions. The Tax Foundation notes that state and local taxes can add 10–20% to your monthly bill, so the true cost of mobile data includes more than just the base plan price.
Prepaid vs Postpaid Data Plans
Choosing between prepaid and postpaid is one of the biggest decisions for mobile data costs. Prepaid plans require you to pay upfront each month, often with no credit check and lower prices. They typically offer 2–15 GB of data for $15–$40 per month. Postpaid plans bill you after the month of service and usually include more features, such as international roaming and device financing, but cost more. A single-line postpaid plan with unlimited data often runs $60–$90 per month. Families can save per line on postpaid, while individuals may find better value on prepaid. The key trade-off is price versus network priority: postpaid customers usually get higher priority during congestion.
- Prepaid: No credit check, lower monthly cost, data caps common, no device financing.
- Postpaid: Credit check required, higher monthly cost, unlimited options, device financing available.
- Hybrid: Some budget providers offer prepaid-like pricing on postpaid networks with reduced priority.
How to Choose the Right Data Plan
To pick the best mobile data plan for your needs, start by tracking your average monthly usage over a few months. Most smartphones have a built-in data tracker in settings. If you use less than 5 GB, a low-cost prepaid plan is likely the best value. If you use 10–20 GB, compare mid-tier prepaid or postpaid plans. Heavy users who stream video frequently should consider an unlimited plan, but watch for deprioritization clauses. Also factor in taxes and fees, which can add 15–20% to the advertised price. Finally, consider coverage in your area: a cheaper plan is worthless if it does not work where you live. Use carrier coverage maps and ask neighbors about real-world performance.