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A value-added service (VAS) is a term commonly used in the telecommunications industry. The term indicates the various services beyond the basics (mostly phone calls and fax) Examples of value added services include voice mail, ring back tone, balance checks, top up, SMS voting, SMS lotteries, recorded messages about expected waiting time, dialing back to the caller to avoid lengthy pre-intro waits for service, and many others. Operators need various kinds of value added services, which they have to change and update frequently.
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