Four months into the Trump Administration, political activists with their congressional representatives on speed-dial may be running a tad short on cell phone minutes. Credo Mobile, a small national cellular carrier, sees that as a good business opportunity. Earlier this month, the company launched an unlimited data plan with a unique selling point. Its formal tagline–“Progress Without Limits”–appears in an online ad alongside images of Trump with a giant “X” over his mouth. That’s just part of Credo’s attempts to align itself with the “resistance,” though it’s in line with the values the company has espoused since its founding–and part...