Make a service inventory
Write down the number of phone lines, any watches or tablets, ordinary monthly data use and the places where service is essential. Separate a phone purchase from airtime. A handset installment can continue to matter even when the mobile plan itself has no long minimum term.
For household plans, establish who owns each number and who can approve changes. Check how removing a line changes the remaining arrangement. An employer reimbursement or family contribution does not automatically confer account ownership.
Read five different data conditions
Look for phone-data allowance, priority during congestion, a fixed speed limit, hotspot allowance and video policy. These describe different behavior. A plan can have unlimited phone data and a much smaller high-speed hotspot allowance.
Ask what happens after each threshold: service may stop, an add-on may be available, speed may change or usage may be managed differently. Do not replace those questions with the single question “Is it unlimited?”
Reconcile the recurring commitment
Check taxes, fees, device installments, optional protection and AutoPay conditions. Note any introductory period and the renewal terms. If an annual option is offered, read cancellation and unused-service conditions before prepaying.
Keep the service summary with its date. A provider may change what it sells without changing every existing customer's plan. Compare the agreement applicable to your line, not a new-customer advertisement alone.