A no-commitment plan means you can leave at any time without paying a termination fee. However, some operators still apply a one-time activation fee or require a minimum subscription period of one month. Always read the contract's cancellation clause, not just the marketing page, to see if a notice period applies.

Prepaid cards usually count data in megabytes per recharge, and unused data often expires when the credit validity ends. Some operators now offer data rollover for an extra fee, but this is not standard. Check whether your plan includes 4G or 5G access at the same speed, or if the network is throttled after a certain threshold.

Portability itself should not cut your line if you provide the correct RIO code and your new operator receives all required documents on time. The switch usually happens within one working day, but delays occur when the address on your old account does not match your new subscription. Keep your old SIM active until the transfer is confirmed.

Many low-cost operators advertise a discounted rate for the first six or twelve months, then increase the monthly price. The renewal price is always stated in the contract, but it is often printed in small type. Before subscribing, note the date when the promotion ends and calculate your average cost over a full year.

Unlimited calls usually apply to calls within France and to landlines in the European Union, but calls to premium numbers, international destinations, or special services are billed separately. SMS is generally unlimited to French numbers, but some operators exclude messages to short codes or paid services. Verify the list of excluded numbers in the plan's terms.

Coverage maps from operators are indicative and often show outdoor coverage rather than indoor signal strength. Check independent coverage tools that aggregate user-reported signal data, and search the forum for recent posts about your postal code. A cheap plan is not useful if you cannot make calls from your home or office.