Do You Need an App to Use an eSIM?

No, you don't need an app to buy, install, or use a co:sim eSIM. Checkout, QR-code delivery, and installation happen through your phone's browser and its built-in cellular settings, with the eSIM emailed within seconds of payment. Some eSIM brands do require an app for part of the process; co:sim doesn't, for any of it.

#Do I need an app to install an eSIM on my phone at all?

No, not on either major platform, and this is true regardless of which eSIM you buy. Apple's own support documentation confirms that iPhone eSIM setup happens through the built-in Settings app: open Settings → Cellular → Add eSIM, then scan the QR code or enter the details manually (Apple Support). Android works the same way through its own Settings menu (typically Settings → Network & internet → SIMs → Add eSIM, with small menu-wording differences by manufacturer). Both platforms have supported this natively for years. An app can make the process feel more guided, but it's never a technical requirement: the phone's cellular radio and Settings app are all it takes once you have a QR code in front of you.

A co:sim Japan eSIM or any other co:sim destination plan installs exactly this way, with no app involved at any point.

#Which eSIM providers actually require an app?

Plenty of well-known eSIM brands lean hard on their apps, but they don't all use it the same way, and the difference matters for whether you actually need one. Airalo lets you buy through its website or its app, and the QR code for installation lives in your Airalo account either way. Critically, the installing device doesn't need the Airalo app at all: Airalo's own help center confirms you can scan the QR code with your phone's native Camera app or install manually through Settings, using a second device, a printout, or the confirmation email to display the code (Airalo Help Center). The app is a convenience, not a requirement.

Holafly built a dedicated eSIM app that can walk newer iPhones through installation automatically, but it still emails a QR code at purchase, and installing through your phone's native settings instead of the app remains an option (Holafly).

Saily, from Nord Security, goes further: its own listing describes buying, installing, and activating your eSIM through the app as the core flow, with no separate QR-code path emphasized (Google Play). For Saily, the app isn't just a convenience, it's effectively the product.

co:sim sits at the Airalo end of that spectrum, minus the app option entirely: everything runs through the website and your phone's own Settings app, with no separate login, download, or account creation forced on you at any step.

#Does co:sim have an app?

No, co:sim doesn't have a dedicated app on the App Store or Google Play, and that's a deliberate choice rather than a gap. Buying a plan, receiving the QR code, installing it, and managing it afterward (checking data usage, topping up, or buying again for a future trip) all happen through the co:sim website, accessible from any phone's browser. Every eSIM you buy stays attached to your account, so returning to cosim.io from any device shows the same plans and usage. The site is also installable as a Progressive Web App, meaning you can add a co:sim icon to your home screen for quicker access if you want to, but that step is entirely optional and isn't required to buy, install, or manage anything. If you never install it, nothing about checkout or your eSIM changes.

#FAQ

#Do I need to create an account to buy a co:sim eSIM?

No, guest checkout is available: you can buy a co:sim eSIM with just an email address and payment details, with no account or password required at purchase. The eSIM's QR code arrives at that email within seconds of payment, so there's nothing extra to set up before you can install it. If you check out with an email that already matches an existing account, the order attaches to that account automatically so your eSIMs stay organized. Buying as a guest doesn't limit access to support or usage checking either, since guest orders can still be looked up and, if needed, linked to an account later. This matters for anyone buying at the last minute before a flight: there's no app to download, no account form to fill out, and no waiting on a verification email before you can move on to installing the eSIM itself.

#Can I install an eSIM without an app on iPhone?

Yes, on any iPhone that supports eSIM (iPhone XS and later, running a reasonably current iOS version), installation happens entirely through the built-in Settings app, with no separate app download involved. Go to Settings → Cellular → Add eSIM, then either scan the QR code with your phone's camera or enter the activation details manually if you were given a code instead of an image. Apple has documented this native flow since eSIM support first launched, and it works identically regardless of which company issued the eSIM (Apple Support). A provider's own app might streamline the steps or auto-detect the QR code from within the app, but it's never the only way in: the QR code emailed to you is genuinely enough on its own, whether you view it on the same phone, a second device, or a printed page.

#Can I install an eSIM without an app on Android?

Yes, Android has supported native eSIM installation since Android 9 on compatible devices, through a similar Settings-based flow: typically Settings → Network & internet → SIMs → Add eSIM, though the exact wording and menu depth vary slightly by phone manufacturer. As with iPhone, you scan the QR code with your camera or the Settings app's built-in scanner, and the profile installs without touching any third-party app. Some Android phone makers bundle their own connectivity apps that can also handle eSIM installation, but these are manufacturer conveniences layered on top of the same underlying Android feature, not a requirement. If your Android phone supports eSIM at all, its Settings menu can install one directly from an emailed QR code, the same way it would for a co:sim eSIM or any other provider's, since the operating system doesn't distinguish between them at the installation step.

#Why do some eSIM companies require an app?

Mostly for account management and a smoother in-app purchase-to-install flow, since bundling the QR retrieval and installation trigger into one app can reduce steps for less technical users. It also gives the provider a channel for upsells, usage tracking, and retention notifications that a plain email-based flow doesn't offer as easily. For a company like Saily, whose parent (Nord Security) already builds consumer security apps, an app-first approach also fits its existing product line. None of this makes an app technically necessary for eSIM installation itself, since both iOS and Android handle that natively, but it does mean the experience differs: some providers make the app the primary or only path, which becomes a real inconvenience if you'd rather not install another app before a trip.

#What do I actually need instead of an app to use a co:sim eSIM?

Just a compatible phone, an email inbox, and a way to view or scan a QR code. After checkout, co:sim emails the QR code within seconds; you can scan it directly from that email on the phone you're installing it on, view it on a second device and scan across, or print it out. From there, installation runs through your phone's native cellular settings, the same Settings → Cellular (iPhone) or Settings → Network & internet → SIMs (Android) path used for any eSIM. No co:sim account creation, app download, or software installation is required at any point, and afterward, checking usage or topping up happens by logging into the co:sim website from any browser, not through a dedicated app.