Worked in mobile Telecoms billing back in the relatively early days. Remember discovering that Orange at the time made a good feature of competing (and acquired lots of new customers) by offering "competitor match" billing options. They made this as a business choice, but it cost them a team of over 100 contractors developing that system. Other telcos had packages but were constrained by what the packages offered as to what their marketing could offer. You pays your money and makes your choice! p.s. things learned the hard way in those early days - customers realised that a call held open for over 24 hours resulted in a reset of billing due to counter wrap around!