It's Cambodia's BIGGEST OFFER! Turn your $1 to $ with the NEW Osja Xchange! Use it for on-net calls or data. It's your choice! Plus, on top of your. Cellcard, a leading telecoms company operating on 4G LTE, a trademark of CamGSM Co. Ltd & part of the Royal Group of Companies, offering prepaid ដូរលុយអស្ចារ្យ · Big Love · គម្រោង XG · ឧបករណ៍. Launched in , Cellcard has become Cambodia's standard for quality, value and service, and continues to be vigilant in developing new ways to support and.