Experts are skeptical that a smartphone can be built in the US based on the specifications, price and timeline laid out by Donald Trump, Jr., and Eric Trump when they announced the phone.

The Trump Organization now has a wireless business, including a mobile phone plan and a $499 gold-hued phone called the T1.

Along with the service, Trump Mobile is rolling out the $499 T1 Phone in August, a “gold smartphone engineered for ...