Several years ago, General Motors introduced a groundbreaking service called “OnStar,” a wireless technology designed to keep drivers safer on the road. Since the 1990s, GM has used the Verizon Wireless network to link cars with OnStar. However, it announced this week at the Mobile World Congress in Barcelona that it’s switching to AT&T Mobility. This is pretty big news — and what we can expect going forward may come as a surprise. This switch is not good news for Verizon Wireless, but it is very good news for AT&T Mobility.