Indosat customers (or folks traveling through Indonesia) may be interested to know that the carrier has teamed with RIM to launch "BlackBerry On Demand," a prepaid option for fetching BlackBerry Internet Service in the country without a multi-year contract. Available in 7-day and 30-day packages, the on demand service is available to customers with prepaid and postpaid voice plans, though there's no word on pricing just yet.