Standard membership has changed and no longer offers "unlimited" mobile calls - just 300 mins.
If you have used up your minutes already then you'll need to buy add-ons to tide you over for the rest of the membership month.
Standard memebership is really no longer worth buying. For €10 you're better off with Guido. If 300 mins is not enough then you may need €20 Don membership which gives 1000 mins.
Hope this helps.