However,like what we have discussed in the earlier section "The1st Way: Sending SMS Messages from a Computer Using a Mobile Phone orGSM/GPRS Modem", usually a better solution is to use ahigh-level SMS messaging API (Application programming interface) /SDK (Software development kit) / library instead of writing your owncode for interacting with the mobile phone or GSM/GPRS modem via ATcommands. The API / SDK / library encapsulates the low-level details.So, an SMS application developer does not need to know AT commandsand the composition of SMS messages in the bit-level. Some SMSmessaging APIs / SDKs / libraries support SMSC protocols in additionto AT commands. To move from a wireless-modem-based SMS solution to aSMSC-based SMS solution, usually you just need to modify aconfiguration file / property file or make a few changes to your SMSmessaging application's source code. The links to some open sourceand free SMS messaging libraries can be found in the article "FreeLibraries/Tools for Sending/Receiving SMS with a Computer".
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