Harold can't get his old iPhone to work with his SIM. Leo says that Verizon used GSM back then, and the iPhone would probably not work anyway because it used G2 towers that were turned off long ago. And they're turning onf 3G as we speak, so older 3G phones are about to go offline. But you could use it as an iPod. How can I get the data off it? Leo says to get iTunes for Windows on your computer, connect that old iPhone, and then it'll copy everything off onto your hardware. Leo also recommends uploading the photos to Google Photos. That way it doesn't matter what phone you have.
Ron wants to know if LTE and GSM are the same. Leo says it isn't at all, and every carrier has made the move to LTE because it allows calls to be transmitted as data, while GSM is still radio-based. It's all data now.
What can he do with his old XP computer? The browsers aren't supported anymore. Leo says that if you can upgrade to Windows 10, that's the best option. But if not, put Linux on it! Leo recommends Manjaro or Ubuntu Linux. Download and put it on a USB Key, then reboot. See if you like it.
John got an "Obama Phone" with AirVoice Wireless. When he got a new Motorola Moto Phone that was unlocked, it says it uses GSM or LTE. And AirVoice Wireless only uses Verizon. Can he use the phone? Leo says that Verizon is CDMA, so a GSM phone won't work. But AirVoice also says they're an AT&T carrier. From the chatroom - input the APN settings listed here and it needs to be a phone that works with AT&T. https://apn.gishan.net/en/apn/airvoice/motorola-moto-g-4g-2nd-gen
Alan has had a bad experience with several cell providers and he doesn't know who to trust. T-Mobile shut down GSM, so he couldn't use his phone. He went to AT&T, and they gave him a data only contract, leaving him without the ability to call or get text messages. He also can't afford to buy a smartphone.
Ryan has an older phone and it won't read his T-Mobile SIM. Leo says that's because the phone doesn't support LTE, just GSM. So it's time to get a new phone. LTE is faster anyway and moving forward, it's the future.
Tim is traveling and wants to know how he can save money on data charges. Leo advises going to prepaidwithdata.wikia.com and he'll find a list of countries and cellphone providers in those countries that offer SIMS, how much they are, and where he can get them. But he'll also want to know if his phone supports the traffic where he's going. Verizon was CDMA up until lately, when they transitioned to LTE world phone models. That means they have SIM cards.
Kris would like to move her iPhone 4 from AT&T to Verizon. Leo says she can't. The phones are the same model, but the iPhone 4 on AT&T has a GSM radio, and the Verizon model uses CDMA. She could get it unlocked and use it on T-Mobile, though. But to go from AT&T to Verizon, she'll need an iPhone 5 or above. In fact, if she can go to Verizon and say she wants to leave AT&T. Verizon actually sells an unlocked iPhone due to a consent decree with the federal government. And then she could use it on any carrier.
Sharon has a Verizon cellphone but wants to get her old AT&T iPhone 4S added to the plan. Verizon said they can't add that phone to their network, though. Leo says back then, AT&T and Verizon phones only worked with either GSM or CDMA technology. If the phone was newer, like an iPhone 5S or iPhone 6, she could do it because they are called "world phones." She may need to unlock it. But the 4S predates the era of iPhone world phones, and it won't work.
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.
Rick says that he hears that with Sprint, if they upgrade to the new iPhone, they won't be able to talk and surf at the same time. Leo says that he can on AT&T and Verizon, though. Verizon moved over to Voice Over LTE and Leo thought Sprint was moving that way too, but apparently they haven't. T-Mobile will also work. Any GSM network will do it, and Leo suspects that Sprint will eventually go that way.