When you use an iPhone for the first time - whether it's a new iPhone fresh out of the box or a used phone that you've gotten from another user - you need to activate it to set up cellular service.

While physical SIM cards have long been the most common to enable cellular services on an iPhone, eSIM technology is more convenient and future-proof. Short for embedded SIM, eSIM involves ...

Short for embedded SIM, eSIM involves activating a mobile network on a SIM card already present in the iPhone for phone calls, text messages, and internet connections.