How to Activate Saily eSIM: Step-by-Step Guide and Comparison with PuraSIM

How to activate your Saily eSIM?

Download the Saily app, purchase a plan, install the eSIM profile from the app, and enable data roaming. According to Saily's official support, the service activates automatically as soon as the phone detects the network at your destination, with no further steps (source: support.saily.com, accessed August 10, 2026).

This promise of "automatic activation" is real and documented by the company itself, but it has conditions: the eSIM must be installed and roaming enabled before arriving, and there are a couple of phone settings that, if overlooked, will prevent automatic activation from working. Let's go step-by-step.

Requirements before installing your Saily eSIM

Before attempting to install the profile, Saily requires three things in its official documentation: an active internet connection (Wi-Fi or data) during installation, an eSIM-compatible and carrier-unlocked phone, and the Saily app installed on the device (source: support.saily.com, "How to activate my Saily eSIM," accessed August 10, 2026).

If you're unsure whether your phone supports eSIM, it's best to check before purchasing any plan, not just Saily's: most mid-range and higher-end devices from recent years support it, but it varies by brand and region of purchase. We have a specific guide on eSIM-compatible phones if you want to confirm before paying. And if you've never installed an eSIM profile, this article on what an eSIM is explains the underlying technology without jargon.

How to activate eSIM step-by-step: Android and iOS

The exact steps vary slightly depending on the operating system. Here's what Saily's official documentation indicates for each (support.saily.com, accessed August 10, 2026):

If the automatic installer fails, Saily offers a manual method: on Android, go to Settings → Connections → SIM Manager → Add eSIM, and enter the activation code displayed in the app; on iOS, go to Settings → Cellular Service → Add eSIM → Enter Details Manually, using the profile data provided by the app (source: support.saily.com, Android and iOS installation articles, accessed August 10, 2026). If you prefer a general guide that isn't brand-specific, we've already written about how to install an eSIM step-by-step.

Does Saily eSIM activate automatically?

Yes, but with an important nuance. Saily's own website promises that the plan "will activate automatically the moment you arrive at your destination" (saily.com, accessed August 10, 2026). This is true as long as the profile is already installed and data roaming is enabled before the trip: automatic activation detects the destination's network, it doesn't detect that you purchased a plan.

"Once the service is activated, it cannot be paused." — Saily Help Center, article "How to activate my Saily eSIM" (support.saily.com, accessed August 10, 2026).

That sentence is more important than it seems: if you accidentally activate your Saily eSIM while still in your home country, or earlier than expected, the plan's counter starts running and there's no way to pause it from the app. It's best to install the profile in advance, but keep roaming off until the day of your trip if your itinerary might change.

What to do if Saily eSIM doesn't activate?

When automatic activation doesn't happen upon landing, Saily's own support recommends, in this order: verifying that the eSIM line is turned on in the phone's network settings, checking for an APN configuration for the Saily profile, and if it's missing, keeping the app open for up to five minutes on Android for it to configure itself. On iOS, if the APN is missing or the connection still fails, the official instruction is to contact support directly (source: support.saily.com, accessed August 10, 2026).

There's an easy-to-miss detail that explains many "it didn't activate" cases: simply turning on Saily eSIM roaming isn't enough. On an iPhone, if you leave "Allow Cellular Data Switching" enabled, the phone might switch back to using your physical SIM in roaming without warning if it loses eSIM signal for even a second, leading to unexpected charges from your home operator that the user never saw coming. Saily's own support includes this as a mandatory step upon arrival at the destination, along with disabling the main physical SIM (support.saily.com, accessed August 10, 2026), but it's easy to skip if you only follow the app's automatic installer.

If the problem persists, it's also worth checking for more general errors that aren't exclusive to any particular brand: we cover them in common eSIM problems.

Can I activate my Saily eSIM before traveling?

You can install the profile before traveling — in fact, Saily recommends it to avoid relying on airport Wi-Fi — but that's not the same as activating it. Installing means downloading the profile to your phone; activating means the data plan starts consuming data. Since the service cannot be paused once active, installing in advance and letting automatic activation happen upon arrival is the sequence that avoids paying for extra days.

There is one exception documented by Saily: if your destination is Turkey, you cannot purchase or activate the plan while already in the country due to local restrictions on eSIM providers, so in that case, you must activate before entering (source: support.saily.com, accessed August 10, 2026). For all other destinations, the "install before, activate upon arrival" logic applies without exception according to their own documentation.

How can I activate my eSIM online, without going to a store?

The entire process — purchase, installation, and activation — is done from your phone, without visiting a store or waiting for a physical shipment. This isn't exclusive to Saily: it's how any well-implemented travel eSIM works, and it's the main advantage over buying a physical SIM at your destination airport. If you want to understand that difference in more detail, we compare it in eSIM vs physical SIM, and if you're interested in why it's better than activating your usual operator's international roaming, we explain it in eSIM vs roaming.

The only step that does require an internet connection is the initial profile installation (Wi-Fi or data), because the phone needs to download the configuration from the provider's server. Once installed, the profile remains saved on the device even if you lose signal.

Saily vs PuraSIM: an objective comparison

This table compares only data that can be verified from the cited sources, without evaluations or invented figures from either side:

Two things are clear from this table: in coverage, both advertise a similar range ("over 200 destinations"), so that's not a deciding criterion on its own. Where there is a verifiable difference is in the activation window: Saily does not publish a fixed timeframe in its help documentation, while PuraSIM states 180 days from purchase. If your travel date might change, it's worth confirming this specific detail with each provider before buying, rather than taking it for granted.

Plans and fair use policy

Saily's prices change by destination and season, so any figures copied into a guide quickly become outdated: it's best to check them on their own site on the day you plan to purchase. Their catalog ranges from small GB plans to unlimited data options, and also offers an optional paid US phone number, with identity verification within the app (source: saily.com, accessed August 10, 2026).

One point that often causes confusion with any eSIM offering "unlimited" data — not just Saily — is the fair use policy: it's common for there to be a high-speed data threshold, and once that threshold is exceeded, a speed reduction. Before purchasing any unlimited plan, it's advisable to read the fine print of your chosen provider, whatever it may be, and check where the threshold is.

Which physical network you actually connect to

A travel eSIM is not a network of its own: it roams on local operators. Which ones you get decides your real coverage, and almost no provider publishes it. These are the networks a PuraSIM eSIM uses, taken from our own carrier agreements and checked on 2 September 2026.

Two questions are worth asking about any travel eSIM, Saily included. First, how many networks you get in your destination: where a plan runs on a single operator you have no fallback if that operator is weak where you are staying. Second, whether the plan can be topped up — if it cannot, running out of data means buying and installing a second eSIM mid-trip.

We publish this table because it is the part of the comparison you can check yourself: land, open your phone settings and read the operator name on screen. PuraSIM covers more than 200 destinations, and the network partners are listed on each destination page.

Frequently asked questions

Conclusion: which one is right for your trip?

If you've already decided to use Saily, the process is as described above: install before traveling, let automatic activation do its job upon arrival, and pay attention to the two settings almost no one mentions — eSIM roaming on and automatic data switching off — to prevent it from activating early or your home operator from charging you by mistake.

If you're still comparing before buying, the verifiable data in this guide shows a similar coverage landscape between both providers, and a concrete difference in the activation window for the plan: 180 days from purchase for PuraSIM, versus a timeframe that Saily doesn't publish in its help documentation. If that window matters to you — for example, because you buy the plan weeks in advance and your travel date might shift — it's an objective criterion worth asking any provider before paying. You can check the available plans by destination in PuraSIM's international eSIM collection, with 24/7 email and WhatsApp support in all languages. And if it's your first time buying an eSIM and you want the full picture before deciding, this general guide to activating an eSIM covers the step-by-step process without being tied to any particular brand.

Written byMarc González Sáez Founder of PuraSIM. He oversees the blog guides, which are built from our wholesale provider's network data, official carrier and manufacturer documentation, and real questions from travelers. If you spot something wrong, write to him and he'll correct it.