(CCSS7) in the US or Common Channel Interoffice Signaling 7 (CCIS7) in the UK
is a system that connects one mobile phone network to another.
The key part is the last three characters – SS7. Short for Signaling System 7
this is a communications protocol used by all mobile carriers and network
across the world. Its purpose is to allow accurate billing for services
performed by one operator’s network for another one’s client. It makes
roaming possible, as well as calling and texting when you are not in
the coverage of one of your carrier’s cell towers.
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