You have always perceived these telecom companies as the biggest brands and end-to-end, networks-to-billing operators but may be you are not aware of the fact that newer management principles are looking at each and every functions of these companies with suspicions and getting most of the work done by sending works to specialized outsourcing vendors. A lot of those companies are outsourcing parts of their network so that they can better concentrate on developing and marketing new services. A few adventurous ones actually outsource everything, effectively operating the brand name only. There are instances when telecom operators are even handing over security issues to outside vendors.
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