Apple’s Handoff lets two iPhones share one number, but it won’t come cheap

TL;DR Apple’s new Handoff feature, which lets you use the same number on two iPhones, won’t be free. T-Mobile, the only carrier to support Handoff at launch, will cost an extra $5 per month. T-Mobile says both phones should be able to use crucial features like calling, SMS, data, and even T-Satellite.