Explain that this is a one-time purchase with no recurring fees.
If you are writing longer copy, consider mentioning these benefits often found on sites like Netgear or carrier pages:
Highlight that the connection starts as soon as they pay.
Short & Action-Oriented (UI/UX)
Fun & Casual Best for cafes, coworking spaces, or modern travel brands. "Rent the Internet for a Day." "Grab a Coffee and 24 Hours of Wi-Fi." "Binge-Watch Ready: Get Wi-Fi for the next 24 hours." Key Selling Points to Include