The business model of the large telecom operator is increasingly challenging, and most telcos are looking for new revenue streams to compensate for stagnant or falling ARPU – combined with hefty investments in new networks. A small but growing number are not just eyeing enterprises or acquisitions to boost their finances, but aiming to sell technologies and services to other operators. This is a high-risk option, as the performance of Rakuten Symphony, one of the most prominent examples of the trend, illustrates. Operators may want to reduce their dependence on the large equipment vendors, but they are also wary of disruption to their usual technologies and procurement processes. The relationship with a fellow operator, from another country, will be very…