SIM cards

Can my Sprint Samsung Galaxy S4 work on AT&T?

Samsung Galaxy S4

Episode 1256

Dan from Jacksonville, IL

Dan's friend broke his phone, and he wanted to let him use his old Samsung Galaxy S4 phone. But Dan has Sprint and his friend has AT&T. Leo says he can try it by just slipping his old SIM into it. If it doesn't work, he'll know. If not, then it's time to get a new phone. But all new mobile devices are LTE now, so they can be used on other networks.

Why do I keep getting a "no SIM card" warning on my iPad 2?

Episode 1225

John from California

John randomly started getting the message that said "No SIM Card" on his iPad 2. He took it to AT&T and they gave him a new SIM card, but after a couple weeks, it started giving him that message again. Leo suspects the issue is something in the iPad, such as a short circuit that's actually frying SIM cards. It is an older iPad, and Leo suggests bringing it to the Apple store. But it most likely won't be a free repair. He shouldn't do anything to it himself -- he should have Apple look at it.

It might just be time to get a new one, though.

How can I prevent getting an expensive cellphone bill overseas?

Episode 1198

Zenia from Inglewood, CA

Zenia is going to Africa next month for a wedding, and she's worried about taking her phone. Leo says that the most expensive thing is data roaming. So the first thing she should do is go in the settings and turn off data roaming. That means she won't get any data while out of the country. However, T-Mobile, Zenia's carrier, offers unlimited international texting, affordable calling, and free EDGE data. It's not fast and she'll probably have to verify that the country she's in will support it. If not, she can always buy an international data roaming plan.

How can I use my phone in Europe?

Episode 1161

Andre from Burbank, CA

Andre is taking his wife on a trip overseas and he wants to use his phone to post to Instagram and other social networks. Leo says that data oversees is a huge and expensive topic because people are wired everywhere, even when they travel. But he won't want to roam in another country because data roaming in obscenely expensive. The first thing he'll want to do it disable data roaming. He'd be surprised how many people come home to a data bill in the thousands and they hardly even used data.

How can I use my iPhone overseas?

iPhone 5

Episode 1007

Bob from Santa Barbara, CA

Bob's wife is traveling to Italy on vacation and wants to know if she should bring her iPhone. Leo says that she could pay for an international data roaming plan. They're not cheap and the data caps are small, not to mention the cell call charges.

Another way is to turn off data roaming. She won't have data unless she has Wi-Fi access, like at her hotel. Some apps, like Google Maps, would allow her to cache data while away from Wi-Fi.