ZemSim is built around a simple mission: provide a stress-free mobile experience with transparent pricing, fair treatment for all customers, and genuine customer satisfaction.

We proactively monitor your usage and may reach out if we think a cheaper plan would suit you better — no tricks, no fine print.

We offer both Travel eSIMs for short-term visitors and mobile plan subscriptions for longer stays. As a small, independent startup, we're not tied to shareholders — every decision puts our customers first.

Key features include same-day billing cycles, fast eSIM activation (typically within minutes), no-hassle cancellation through the app, and competitive pricing.

We're working on exciting new features and sustainability initiatives — stay tuned!

Unlike many providers that use 28- or 30-day recharge cycles, we keep things simple: your billing date is the day you signed up. You're charged on the same date every month — no complicated calendars to track.

This means you get 2-3 extra days per month compared to 28-day plans, which adds up to roughly one free month every year!

Absolutely. Just provide your current number details during sign-up and we'll handle the porting process. You can initiate the transfer from the app whenever you're ready.

Porting usually takes 10-15 minutes. We'll keep you updated if anything needs your attention.

Important: Don't cancel your old service before the port completes — you'll need to receive a security SMS to verify the transfer.

Your Apple Watch can connect through your phone via Bluetooth when it's in range. However, we don't currently offer a standalone cellular connection for the Watch — that's a feature only provided by the major carriers, typically at an extra cost.

Yes! You can add as many numbers as you like to your ZemSim account. Switching between them is easy from the account dashboard.

To keep the same billing date for all numbers, simply purchase and activate them on the same day.

We're eSIM-only, and here's why: plastic SIM cards create unnecessary waste and take days to ship. With eSIM, you can be connected within minutes of placing your order — no waiting, no lost packages.

eSIM is the future. Those tiny plastic cards and the metal pin you always lose are being phased out across the industry. Why wait?

For Travel eSIMs, we partner with premium local carriers in each destination to deliver fast 4G/5G connectivity. Check our product pages for specific network information for each country.

Having connectivity issues? Let us know and we'll investigate with our network partners.

After purchase, you'll receive your eSIM QR code instantly via email. Simply go to your phone's settings, select "Add Mobile Plan" (or similar), and scan the QR code. Full step-by-step guides are available on our installation page.

We're here for you! Reach us on Messenger, WhatsApp, or email at hello@zemsim.com. Real humans, no chatbots, no hold music.