The T-Mobile merger, which was announced more than a year ago, could bring about a seismic shift in the mobile world. Dish’s emergence as a new wireless player gives consumers another potential alternative for service — it vows to cover 70 percent of the US with 5G by 2023. T-Mobile and Sprint’s combined assets could jump-start its 5G ambitions, pushing the industry further into the next-generation technology. They have also said they’ll lock in prices for at least three years.