According to some affiliates' statistic data...

1. How many times do users buy and/or recharge phone card(s)
   per month:
   • 1            - 74% of all users
   • 2            - 16%
   • 3 to 4      - 6%
   • 5 to 6      - 2%
   • 7 or more - 2%
2. How many times do users buy and/or recharge phone card(s)
   for long time:
   • 1            - 60% of all users
   • 2            - 17%
   • 3 to 4      - 10%
   • 5 to 6      - 6%
   • 7 or more - 7%
3. How much time do users spend to choose and order calling cards:
   • 5 minutes or less     - 25% of all users
   • 6 minutes to 10      - 28%
   • 11 minutes to 20    - 19%
   • 21 minutes to 30    - 15%
   • 31 minutes to 40    - 4%
   • 41 minutes or more - 9%
4. How much do users spend on phone card(s) per month:
   • $10 or less  - 47% of all users
   • $11 to $20  - 28%
   • $21 to $40  - 10%
   • $41 to $60  - 8%
   • $61 to $80  - 4%
   • $81 or more - 3%
5. What cards do users buy:
   • with maintenance fee     - 10% of all sales
   • without maintenance fee - 90%
   and also
   • with 1-minute rounding - 56% of all sales
   • with 3-minute rounding - 44%
6. Geolocation:
   • USA     - 89% of all users
   • Canada - 8%
   • UK        - 2%
   • Mexico  - 1%
7. One user was buying and recharging different calling cards 18 times for a month.
8. One user was buying and recharging the same phone card 14 times for a month.
9. Most users keep on buying or recharging phone cards of the same brand names during a month and even further.
10. More than one user spent maximal $350 on calling cards a month.
11. Repeat sales are 52% of all sales.

You can compare these common statistic data with figures on separate calling card - Continental card.