90 Days Subscription plans

[Feedo90]

I noticed that there are 90 days plans on the main page that are cheaper (saving 1$/month) but I couldn't find those plans when I log in to my account, although there is a mention for that "Choose the speed and subscription that's right for you. Save more with a 90-day subscription"

How can I subscribe for the 23$ /month (6 GB data) with 90 days plan (22$ /month)?

[slusagm]

not all plans have 90 days option.  

and if you are existing customers, no plan available for existing customers has a 90 days option at this time