Fix eSIM Cannot Connect to Network on iPhone 15

When your iPhone 15 sits at "No Service" or "Searching..." after installing an eSIM, the cause is almost always one of five things: a settings toggle, a network selection issue, an iOS bug, a SIM lock, or a data plan that has not yet activated. This guide walks through each in order, starting with the quickest fix to try first.

If you bought an eSIM from us and need a new QR code, contact our support team — we keep the QR available for re-installation for 180 days.

Before You Start

Make sure these basics are correct before going deeper:

• Your iPhone 15 is carrier-unlocked. Most US iPhone 15s sold after Sept 2023 are eSIM-only and unlocked, but some carrier-financed phones are locked until paid off.
• The eSIM profile is already installed on the phone (Settings → Cellular shows it as a line).
• You have a stable Wi-Fi connection for the initial activation handshake.
• You are inside the country the plan covers, or arriving within the next hour.
• Your iOS version is 17.0 or later (older iOS 16 builds had eSIM activation bugs that Apple fixed in 17.4).

Fix 1: Turn On Data Roaming for the eSIM Line

This is the cause of about 40% of "no service" reports we see. Travel eSIMs use roaming agreements with local carriers — even though you are using the eSIM as your primary data line, iOS treats it as roaming and blocks connections unless Data Roaming is enabled.

1. Open Settings → Cellular.
2. Tap your eSIMSupra line (often labeled "Travel" or with the country name).
3. Toggle Data Roaming to ON for that specific line.
4. Wait 10–15 seconds for the line to register.

Important: Data Roaming must be enabled per line on iPhone 15. Turning it on for your home line does nothing for the eSIM.

Fix 2: Toggle Airplane Mode

If Data Roaming was already on, force the radio to re-register:

1. Swipe down from the top-right of the screen to open Control Center.
2. Tap the airplane icon (turns orange when active).
3. Wait 30 full seconds.
4. Tap the airplane icon again to disable.

The eSIM should reconnect within 10–20 seconds. If it still says "No Service," continue to Fix 3.

Fix 3: Set the eSIM as Your Cellular Data Line

iPhone 15 supports two active SIMs (one physical, one eSIM, or two eSIMs). The phone needs to know which line to use for mobile data.

1. Open Settings → Cellular → Cellular Data.
2. Select your eSIMSupra travel line.
3. Below that, set Default Voice Line to your home line if you still want to receive calls and iMessage on your usual number.
4. Enable Allow Cellular Data Switching if you want iOS to fall back automatically when one line has no signal.

Without this step, the phone keeps trying to use your home carrier (which has no signal abroad without expensive roaming).

Fix 4: Manually Select a Network

Some travel eSIMs route through specific carriers in each country. If iOS is auto-selecting a partner network that does not have a roaming agreement with your eSIM provider, you will see "No Service" even with Data Roaming on.

1. Open Settings → Cellular.
2. Tap your eSIMSupra line.
3. Tap Network Selection.
4. Toggle Automatic to OFF.
5. Wait while iOS scans available networks (30–60 seconds).
6. Pick a carrier from the list. If you see one matching the network listed on your eSIM purchase confirmation, choose that one. Otherwise pick the strongest signal in the list.

Browse our destination pages to see which local carriers each country eSIM connects to — the network is shown under "What your eSIM connects to" on every country page.

Fix 5: Check for SIM Lock or APN Issues

If you bought an iPhone 15 financed through a US carrier (T-Mobile, AT&T, Verizon), it may still be locked. Check:

1. Go to Settings → General → About.
2. Scroll to Carrier Lock.
3. If it says "No SIM restrictions," the phone is unlocked.
4. If it says "SIM locked," contact your home carrier — they must unlock it before any third-party eSIM will work.

For APN (Access Point Name) issues, most travel eSIMs are configured automatically. But if Network Selection finds carriers and you still cannot connect, manually setting APN can help. The correct APN is included in the activation email from eSIMSupra. Enter it under Settings → Cellular → [eSIM line] → Cellular Data Network → APN.

Fix 6: Reset Network Settings

This is a heavier reset. It will erase all saved Wi-Fi passwords, paired Bluetooth devices, and VPN configurations. Only do this if Fixes 1–5 did not work.

1. Open Settings → General → Transfer or Reset iPhone.
2. Tap Reset → Reset Network Settings.
3. Enter your passcode.
4. The phone restarts.
5. Reconnect to Wi-Fi, then check if the eSIM connects.

After reset, you may need to re-enable Data Roaming on the eSIM line (Fix 1).

Fix 7: Re-Install the eSIM Profile

If the profile itself is corrupted (rare but possible if installation was interrupted), remove and re-add it:

1. Settings → Cellular → [eSIM line] → Remove eSIM.
2. Confirm.
3. Re-scan the original QR code from your eSIMSupra activation email, or use the manual installation details (SM-DP+ Address and Activation Code).

Your QR code stays valid for 180 days from purchase. If you cannot find your activation email, contact our support and we will resend it.

iPhone 15 Specific Quirks to Know

When to Contact Support

If you have worked through all 7 fixes and still see "No Service," the problem is likely:

• The eSIM has not been provisioned yet (sometimes takes 10–15 minutes after purchase)
• You are outside the country the plan covers
• The local carrier is having a regional outage
• The eSIM activation policy differs from what is shown in iOS

Reach our 24/7 support via the contact page or live chat — we will check your activation status against the supplier system within minutes.

FAQ

How long does an iPhone 15 eSIM take to activate the first time?

Most eSIMs activate within 1–5 minutes after the first network registration. Plans labeled "First Network Connection" only start the validity timer when the phone connects to a tower in the destination country, so installing the eSIM at home before travel will not consume your data.

Can I use eSIMSupra on iPhone 15 alongside my home SIM?

Yes. iPhone 15 supports Dual SIM (one physical + one eSIM, or two eSIMs). You can keep your home line active for calls and iMessage while using the eSIMSupra travel line for data. Set this in Settings → Cellular → Cellular Data.

Does turning on Data Roaming charge me extra?

For your eSIMSupra travel line, no — the plan is prepaid and includes the data you bought. Turning on Data Roaming on your home carrier line, however, can trigger expensive charges from your home carrier. Toggle Data Roaming only on the eSIM line, not on the home line.

My iPhone 15 says "Activation Required" but I bought the eSIM. What now?

This usually means the QR scan was interrupted before completing. Remove the partial profile (Settings → Cellular → that line → Remove eSIM), reconnect to Wi-Fi, and re-scan the QR code from your activation email.

Do all eSIM plans work on iPhone 15?

Yes — iPhone 15 supports all standard travel eSIMs. The phone is eSIM-only in the US (no physical SIM tray) and Dual eSIM elsewhere. See our compatible phones guide for full details.

Still Stuck?

If you have tried everything and still cannot connect, we are here to help — reach out via live chat or email and we will check the activation log on the supplier side. Most cases resolve within 10 minutes.

Need to compare plans for your next trip? Use our roaming savings calculator to see how eSIMSupra prices stack up against your home carrier's roaming rates.