Because when you buy your first €12.99 membership plan you are also charged a one-time activation fee of €12.99:
€12.99 Plan
This €12.99 Plan is only available to new 48 customers who order their 48 SIM and purchase a €12.99 Plan from the 5th April 2022. A one-time activation fee of €12.99 applies with the first plan purchase.
Note that you should qualify for the "second month free" offer available at the moment which effectively cancels out the activation fee charge:
62. December 2024 - February 2025 - 48 One Month Free Promotion
The following terms and conditions for the one Month Free plan Promotion (the “Promotion”) are in addition to the 48 Terms of service https://48.ie/legal/terms-and-conditions.
Promotion: Free 1 x €12.99 monthly 48 plan subject to the below eligibility criteria.
Promotion Dates: 17th December 2024 – 28th February 2025 inclusive.
I don't really understand what you mean by "my plan to pay 12.99 four months".
Your post seems a bit unclear.
If you need to contact 48 support about this then see the links in my signature below.
