Tina wants to know if Verizon has improved their call quality. She left because it was so bad. Leo says that thanks to VoLTE, (Voice over LTE), the call quality has improved remarkably. Additionally, some carriers also support Wi-Fi calling, which has fantastic call audio quality. Most carriers offer two week trials where if you don't like the service, you can return the phone and cancel. So give Verizon another try. The quality has improved.
Mike got a Droid Turbo, but he can't work Internet and be on a call at the same time. Leo says that's one of the issues with the Turbo since it has only one antenna. You can't. But Verizon may be changing that in the coming months as Verizon moves to VoiceOver LTE (VOLTE). When it does, an upgrade will fix the problem. But only if VOLTE is supported in your market.
Mike would like to have a cellphone that he can use over multiple carriers. Leo says that while everyone is moving to LTE and Voice Over LTE, we're not there yet. Half the phones are CDMA, the other are GSM. Verizon has a SIM card for modern LTE supported phones that will work over any network except Sprint. And the phones are unlocked by FCC mandate. So that's probably Mike's best bet.