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I am in the same boat as OP and the blog's example is a PBX software for business. I was also confused. Major carriers are like Vodafone, T-Mobile, O2, Telia e

I am in the same boat as OP and the blog's example is a PBX software for business. I was also confused. Major carriers are like Vodafone, T-Mobile, O2, Telia etc :)