Benefits, Pricing & Top Apps Compare eSIM apps for travelers and learn how they work. TooSIM offers quick activation, region-wide plans, clear pricing, and strong support—ideal for country-hopping.

A SIM card, or subscriber identity module, is a small card in your cellphone that lets you place phone calls, send text messages, and more.

But don’t worry, you can still switch cards or change numbers just as easily. Since eSIMs are part of your phone, they’re ...