After you purchase and use your cellphone for an extended period of time, you can change networks. However, the phone that you're currently using may not be offered on that network. If you wish to ...

SIM cards have been an integral yet often forgotten part of owning a smartphone for the past few decades. For most users, the SIM card defines the basic commercial relationship they have with their ...

Just book your dream vacation overseas? The next step is to avoid costly roaming fees by getting an affordable international sim card for traveling. When traveling overseas, it’s critical to have a ...

"I failed yesterday, so I lined up early to replace my SIM card before going to work." On April 29, in front of an SK Telecom agency in Jung-gu, Seoul, people were waiting from 8 a.m. on the second ...

If you’ve bought an iPad with 4G/cellular capabilities (we discuss whether that’s a good idea in our 2015 iPad buying guide) or a new iPhone, you need to buy and install a SIM card. Here, we explain ...