Messaging with the Wireless Messaging API
Nearly all CLDC devices and some CDC devices provide hardware that connects to the now-ubiquitous worldwide cellular networks. In addition to providing wireless IP connectivity to Java ME-enabled devices, these networks provide wireless messaging over other protocols, such as SMS and MMS. To enable your applications to access these wireless messaging protocols, Sun Microsystems and its partners developed the Wireless Messaging API (WMA), a comprehensive suite of messaging interfaces built atop the GCF. WMA is an optional package for Java ME devices that JSR 120 originally defined and JSR 205 extended to support MMS.
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