When you wanna be a Proximus client, this might intrest you:

Pay & Go, prepay by Proximus.

you call mostly at night or during the weekends (in other words during off-peak hours) you make three to six calls per day, primarily during the day (in other words during peak hours). you make frequent calls during peak hours, more than six calls a day are no exception.

This is a box with a high quality GSM and a activated SIM-card.