RoamTheWorldCellPhones.com

Cellphone GSM Frequencies: 850/1800

(This means you will need a GSM cellphone that will work on 850MHz or 1900Mhz to use it in Guam.)

Cellular carriers for Guam

DOCOMO PACIFIC, INC.

Frequency: GSM 1900
Website: www.docomopacific.com

Coverage Map (NONE)

IT&E Overseas, Inc (IT&E Wireless)

Frequency: GSM 1900
Website: www.ite.net

Coverage Map (NONE)

Pulse Mobile LLC (GTA Wireless)

Frequency: GSM 850/1900
Website: www.gta.net

Coverage Map

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