The short answer
Use the label to compare the regular price, introductory period, fees, data allowance, speeds, and contract terms on the same basis.
Step by step
Start with the monthly price and note exactly when any introductory rate ends.
Add recurring equipment, network-management, and other required charges to the advertised price.
Record one-time activation, installation, and early-termination costs.
Compare typical download speed, upload speed, latency, and data allowance rather than relying on the maximum advertised speed.
Open the linked network-management, privacy, and discount details before ordering and save a copy of the label.
Before you finish
Keep screenshots, receipts, chat transcripts, confirmation numbers, and the first bill after a change. Carrier terms and account eligibility can change, so verify the final price and conditions directly before submitting an order.