Normally you have 2 days or more days for free using. It depends on what periods (summer holidays, big sales...) or you can ask to send our support team a ticket about this.
After a trial days, you can activate a license by make a purchase.
Thee are some subscription type - it is 1 month, 3 months, 6 months or 1 year.
and there are some different packages such as Standard, Premium and Gold package.
You can make purchase directly at main page fonetracker.com here:
After that you can get a license code from an email notification. Login to the control panel and apply that license code.
Or you can login to your control panel site at https://my.fonetracker.com and click Account menu, find the button "Renew Now".
You can make purchase with PayPal, Visa/master cards, Affiligate.com account, ...