Troubleshooting

eSIM troubleshooting: no service, no data, APN and install errors

Twelve problems and their fixes, from "no service" after landing to "PDP authentication failure" and "cellular plan cannot be added". Work down the list in order.

Read the steps WhatsApp support

Quick facts

First fix Airplane mode on for 10 seconds, then off

Second fix Data roaming on for the travel line

Third fix Manual network selection

Fourth fix Check the APN

Still stuck WhatsApp support, 24/7

Most eSIM problems have one of four causes: the travel line is off or not set as the data line, data roaming is off for it, the phone has latched onto a network that is not a partner, or the APN is wrong.

Guide reviewed on 25 October 2026 · Hotspot allowed on every plan · Full refund if your phone cannot install the eSIM

Before you start: the four settings

Travel line is oniPhone: Settings, Cellular, travel line, Turn On This Line. Android: SIM manager, travel line enabled.
Travel line is the data lineiPhone: Settings, Cellular, Cellular Data. Android: SIM manager, Mobile data.
Data roaming on for the travel lineTravel eSIMs are roaming profiles by design. With roaming off they never connect.
Home SIM data roaming offPrevents surprise charges and stops the phone preferring the wrong SIM.

Problems and fixes

Symptom Likely cause Fix No service after landing Phone has not searched for a partner network yet Airplane mode on for 10 seconds, then off. Wait 60 seconds. If still nothing, select a network manually (below). Connected to a network but no data Data on the wrong line, roaming off, or wrong APN Check the four settings. Then check the APN against the email. "PDP authentication failure" (iPhone) APN or roaming mismatch after a network change Toggle Data Roaming off and on for the travel line, cycle Airplane mode, then reset the APN: Settings, Cellular, travel line, Cellular Data Network, Reset Settings. Enter the APN from the email if one is listed. Network keeps dropping or shows "Emergency calls only" Latched onto a non-partner network Manual selection: iPhone Settings, Cellular, travel line, Network Selection, Automatic off, choose a network from your destination page. Android: Mobile networks, Network operators, Search, choose. Data very slow On 3G or 2G, or unlimited plan past 2GB daily full-speed allowance Set preferred network type to 5G/4G (LTE). Unlimited plans run at 3Mbps after 2GB a day and reset at midnight destination time. "Cellular plan cannot be added" (iPhone) Code already used, Wi-Fi dropped, or carrier lock Confirm the QR has not been scanned on another device. Reconnect Wi-Fi and retry with manual entry. Check Settings, General, About, Carrier Lock. If used on another phone, contact us. "This eSIM is already installed" or "profile already downloaded" Profile exists on this phone or was installed on another Look for the line in SIM settings; it may be hidden or disabled. If installed elsewhere, contact us with your order number and EID. "Unable to activate" or stuck on Activating Server busy or weak Wi-Fi Wait two minutes, keep the phone on the screen, retry on a different Wi-Fi network or on home-SIM mobile data. QR code will not scan Screen brightness, reflections, or code on the same phone Brighten the other screen, zoom in, or use manual entry with the SM-DP+ address and code. Hotspot not available Hotspot follows the data line; data still on home SIM Set Cellular Data to the travel line, then enable Personal Hotspot. Hotspot is allowed on every plan. See hotspot not working. 5G not showing Partner network offers LTE on roaming, or the phone lacks the band LTE is normal on many roaming agreements. See 5G not showing. Worked yesterday, dead today Plan expired, data exhausted, or network roamed into a non-partner Check the balance in the app (how). Top up or cycle Airplane mode.

Manual network selection, step by step

iPhone: Settings, Cellular, tap the travel line, Network Selection, switch Automatic off, wait for the list, tap one of the networks named on your destination page. Android: Settings, Connections or Network and internet, Mobile networks, choose the travel SIM, Network operators, Search networks, choose manually. Return to Automatic once you are connected, or leave it manual if the phone keeps wandering.

APN settings

Most plans configure automatically. If your email lists an APN: iPhone, Settings, Cellular, travel line, Cellular Data Network, type the APN under both Cellular Data and Personal Hotspot, leave username and password blank. Android: Mobile networks, Access Point Names, add new, Name and APN both set to the value, save, select it.

When to contact us

If the four settings are right, Airplane mode and manual selection have not helped within 10 minutes, and the balance shows data remaining, message us on WhatsApp at [WhatsApp number] or email hello@universalesims.com with your order number, phone model, EID (dial *#06#) and a screenshot of the Cellular or SIM settings screen. Support is 24/7 in English and Hindi.

Frequently asked questions

Why does my eSIM say "No Service"?

The line is off, roaming is off, or the phone has not found a partner network. Cycle Airplane mode, confirm data roaming is on for the travel line, then select a network manually from the list on your destination page.

What is PDP authentication failure?

An iPhone error meaning the data session was refused, usually after a network handover. Toggle Data Roaming for the travel line, cycle Airplane mode and reset the Cellular Data Network settings. It is not a billing problem.

Do I need to set an APN?

Usually not. If data does not start and the email names an APN, enter it under the travel line only.

Does Airplane mode really help?

Yes. It forces a fresh network search and re-registration, which resolves most "no service" cases within a minute of landing.

I deleted the eSIM by mistake. Can I reinstall it?

Travel eSIM profiles install once. Contact us with your order number; where the plan allows we issue a replacement for the unused balance.

My plan shows used but I never connected. What happened?

Validity starts on first connection. If the line connected briefly at the airport or during a layover in a covered country, that counts. Check the usage log in your account and contact us if it looks wrong.

Does a VPN break the eSIM?

No, but some VPNs block the activation handshake. Turn the VPN off during install and first connection, then back on.

Related help

• eSIM not activating
· • Hotspot not working
· • 5G not showing
· • Install on iPhone
· • Install on Android
· • Contact support
· • Help centre

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