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Clockwork SMS - Clockwork is an Easy Text Message API. An SMS API for Developers. Build powerful apps and include SMS. Signup is free, Try it now.
Callmama - Get cheap international calling, international virtual number, Call Mama Gives an added advantage to send message and make calls to non-user of Callmama App.
Melrose Labs SMSC Simulator - SMPP SMSC simulator to test SMS messaging applications.
CallHippo - Easy to use Phone System with World-Class Support
HotTelecom - Our company offers virtual phone numbers, toll-free numbers, PBX, SMS numbers and numbers for a registration more than 100 countries. Buy Now!
KrispCall - Virtual cloud phone system for business