RoamTheWorldCellPhones.com

Cellphone GSM Frequencies: 900/1800

(This means you will need a GSM cellphone that will work on 900MHz or 1800Mhz to use it in Belgium.)

Cellular carriers for Belgium

Belgacom Mobile (PROXIMUS)

Frequency: GSM 900/1800
Website: www.proximus.be

Coverage Map

KPN Group Belgium NV/SA

Frequency: GSM 900/1800
Website: www.kpngroup.be

Coverage Map

Mobistar S.A.

Frequency: GSM 900/1800
Website: www.mobistar.be

Coverage Map

If you've used either of these networks or roamed in Belgium, please post about your experience and the cost. Feel free to ask questions.