Usually not. A top-up is generally only possible while the plan is still within its validity window. Once it has expired a new plan is required instead. Check the expiry date in your confirmation email or order page before deciding.

Not always. Some options add only data while the original expiry still governs; others extend it too. Always read the description of the option shown on the order page before confirming.

No. A top-up only adds volume or validity to the existing plan under that plan's own terms. If you need different terms, buy a new, separate plan instead, which becomes an entirely separate profile.

Wait a little and toggle airplane mode once, since the on-device figure usually lags the system slightly. If it still has not appeared, check that top-up's order status, then contact the team with the order number rather than buying another top-up.

Check each profile's order name or number in your account before confirming, and select the one matching the line actually in use, not another profile that is merely installed and idle.

Yes. Each top-up is its own payment with a separate order number and receipt, even though it applies to the same profile. If you need a combined document, contact the team with every related order number.