Channel Islands-based operator JT has announced the start of domestic 4G mobile service in the US through a strategic partnership with a major global mobile operator, reports Telecompaper.com, which notes that JT has an MVNO service at domestic rates, with JT 4G SIM cards going on sale across the US in May. These will also be available at JT retail outlets and other local distributors for islanders to purchase before travelling to the US.