** Shares of U.S. telecom firms dip in premarket trading
** AT&T T.N falls 0.5%, Verizon Communications VZ.N off 0.3%, while T-Mobile TMUS.O down 0.2%
** Trump Organization - main holding entity of President Donald Trump's business ventures - unveils self-branded mobile service called 'Trump Mobile'
** Says 'Mobile' to have numerous features, such as roadside assistance and telemedicine
** Payment processing partners include PayPal PYPL.O and Stripe, while shipping ones include UPS UPS.N and FedEx FDX.N
** Shares of PYPL and FDX up over 1% premarket
** New venture to have phones made and call centers based in the U.S.
** Trump's social media firm, Trump Media and Technology DJT.O also gains 2%
** Till last close, T up 23% YTD, while TMUS up 3%, VZ up over 7% in the same period