Tier 2
Tier 2 SMS aggregators maintain direct SMPP connections with at least three of the five major U.S. wireless carriers, and settlement agreements with two of the five. Unlike Tier 1 firms, they support only carrier-grade SMS capabilities, but they still provide the same type of high-level 24/7 service agreement. Similarly, they publish content only where the rights to that content are clearly owned by the customer (e.g., they won't knowingly plagiarize or spam).
Syniverse www.syniverse.com
3CInteractive www.3cinteractive.com
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