 You're listening to Mike Gallagher on Valley News Talk, KVNT, 1020 a.m. and 92.5 FM. You're going to be saying for a long time now that cell phone service with Pure Talk is half the cost of Verizon, AT&T, or T-Mobile. You hear just $20 a month for unlimited talk, text, and plenty of data, and you might be thinking, what's the catch?