Radio Shack will make a major push in iPhone sales this Sunday, a report claims. A front-page promotion is expected to kick off the expansion of sales to 3,000 out of 4,500 stores across the US, making Radio Shack the second-largest iPhone retailer in the country, bigger than Best Buy or even the device's official cellular carrier, AT&T. Walmart will continue to have the largest number of physical sales locations.
