The mobile industry has been evolving rapidly over the past decade, with the emergence of smartphones, 4G networks, and a wide range of new mobile services. This evolution has been driven largely by the carriers, who have invested heavily in network infrastructure and spectrum. However, there are signs that the carriers may be losing focus on their core business.

One sign of this is the decline in voice revenues. Voice revenues accounted for over half of carrier revenues in 2009, but they have been declining ever since. This decline is due in part to the rise of over-the-top (OTT) services, such as Skype and Viber, which allow users to make voice and video calls over the Internet without using a carrier's network.

Another sign of the carriers' loss of focus is the increase in customer churn. Churn is the rate at which customers leave a carrier for another one. Churn rates have been increasing over the past few years, as customers become more frustrated with their carriers' high prices, poor service, and lack of innovation.

In order to address these challenges, the carriers need to refocus on their core business. This means providing customers with high-quality voice and data services, at affordable prices, and with excellent customer service. The carriers also need to be more innovative, and they need to invest in new technologies that will keep them ahead of the competition.

If the carriers can refocus on their core business, they will be able to regain the trust of their customers and continue to grow their businesses. However, if they continue to lose focus, they will eventually be left behind by the OTT players and other new entrants to the market.

Here are some specific recommendations for how the carriers can refocus on their core business:

* Improve voice and data services. The carriers need to make sure that their voice and data services are reliable and affordable. They also need to offer a variety of plans that meet the needs of different customers.

* Improve customer service. The carriers need to make it easier for customers to get help when they need it. They also need to be more responsive to customer complaints.

* Be more innovative. The carriers need to invest in new technologies that will keep them ahead of the competition. They also need to be willing to experiment with new business models.

By following these recommendations, the carriers can refocus on their core business and continue to grow their businesses.