Hey, it’s been a long time…
There is no trick, but you can buy extended time and not buy additional minutes.
I do it yearly.
Log into account
find your device
Buy airtime
add the $15 card or any amount to cart
one time purchase
Right under “Benefits Below”, you will see an option for extra service days. $49 for 365 days
Click Add, it goes to your cart along with the $15 minutes card
Go to Order Details, same page, right above “Benefits Below”.
click trash can next to the $15 card.
now all you have is the $49 365 day service in cart.
buy it.
It’s worth to keep account active for one year.
Good luck.