Last updated on 10 November 2026
Is your iPhone showing an error while you add an eSIM? Check Settings › Cellular first: the eSIM is often already there. The message “Unable to Activate eSIM” came up in 12 of 131 WhatsApp conversations with our support team between February and October 2026, and in most of them the eSIM was already installed as the bottom line in that menu. Every destination is in the POVNOMAD eSIM store.
Below are the messages iOS 26 can show when you add or activate an eSIM, in Apple’s exact English wording. We looked up each one in the iOS 26.7.1 language files (as of 1 November 2026). UK iPhones say “Mobile Service” instead of “Cellular” and “network provider” instead of “carrier”; we give the UK text where it differs. Messages whose wording we could not verify are left out.
Which error messages does the iPhone show when you add an eSIM?
| Message on the iPhone | How you recognise it | What you do | Menu path |
|---|---|---|---|
| “Unable to Activate eSIM” | Only one button, “OK”, often right after the scan or after tapping the installation link | Do not scan again. The eSIM is usually installed already. Then continue with eSIM installed but no internet | Settings › Cellular › bottom line |
| “eSIM Cannot Be Added” with “This code is no longer valid. Contact your carrier for more information.” | Usually on the second scan of the same code | Stop scanning the code. Look for the line under Cellular. If it is missing, message our support | Settings › Cellular |
| “Cellular Plan Cannot Be Added” (UK: “Mobile Plan Cannot Be Added”) with “This code is no longer valid.” | Same situation, different heading | As above: find the line, do not scan again | Settings › Cellular |
| “Could Not Set Up eSIM” with “The eSIM cannot be set up on this device as it is locked to another carrier.” | Your iPhone is carrier-locked | Ask your home carrier to unlock it. Otherwise, a refund | Settings › General › About › “Carrier Lock” |
| “Cellular Plans from This Carrier Cannot Be Added” with “Your device can only use cellular plans from a different carrier.” | Also a carrier lock | Same as the row above | Settings › General › About |
| “This eSIM is not compatible with this iPhone. Contact your carrier for more information.” | Appears while adding the eSIM | Check the carrier lock. If the iPhone is unlocked, message our support | Settings › General › About |
| “Choose Phone Number to Turn Off” with “Only two phone numbers can be active at once.” | Two lines are already switched on | Pick a line to turn off, for example an old travel eSIM | Choice inside the dialog |
| “Choose a Cellular Plan to Turn Off” with “To start using your plan, one of your existing cellular plans must be turned off.” | Same reason, other version | Turn off one active line | Settings › Cellular › line |
| “More Memory Required” with “To install this eSIM, you’ll need to free up memory by removing unused eSIMs.” | Many old eSIMs are stored on the iPhone | Delete an old, expired eSIM, never the new one | Settings › Cellular › old line › “Delete eSIM” |
| “Invalid Activation Code” with “The activation code that you are attempting to use is not valid.” | Only with manual entry | Copy the code from the installation link instead of typing it, with no spaces | “Enter Details Manually” |
| “Invalid SM-DP+ Address” | Only with manual entry | Do not swap the SM-DP+ address and the activation code | “Enter Details Manually” |
| “Cellular Is Being Configured” (UK: “Mobile Service Is Being Configured”) with “If cellular is not available for your device in a few minutes, try again.” | The installation is still running | Wait a few minutes, then check under Cellular | Settings › Cellular |
| “Unable To Continue Cellular Configuration” with “Plan configuration failed. Please try again.” | General abort | Check Wi-Fi, switch Airplane Mode on and off, restart, then try again | Settings › Cellular › “Add eSIM” |
Basis: message texts from the English (US and UK) iOS 26.7.1 language files (build 23H30), looked up on 1 November 2026 at applelocalization.com; menu paths from Apple Support. Case counts from 131 WhatsApp conversations with our support team, 10 Feb to 7 Oct 2026, more than one cause per conversation possible. Which version of a message iOS shows depends on the device and the carrier.
“Unable to Activate eSIM”: is my eSIM there anyway?
Usually, yes. In our 12 cases with this message, the code had mostly been redeemed already and the eSIM was installed. Open Settings › Cellular and scroll down. The newest eSIM is the bottom line that is switched on. Older eSIMs show there as, for example, Used as “Travel” · No Number.
Only if no new line appears there did something go wrong during installation. If the line is switched off, tap it and switch on “Turn On This Line”. In your destination you then need data roaming for the eSIM, explained step by step in eSIM installed but no internet.
The same situation can also arrive as a notification: “Your eSIM could not be activated. Contact your carrier for assistance.” Check under Cellular first in that case too.
What does “This code is no longer valid” mean?
An eSIM code can be redeemed once. If you scan the same QR code again after “Unable to Activate eSIM”, you get “eSIM Cannot Be Added” with the line “This code is no longer valid”. Most of the time the message just tells you that this eSIM already sits on a device.
If the line is still missing under Cellular, the eSIM may have been deleted or installed on another phone. Then only a replacement eSIM helps. From 10 Feb to 7 Oct 2026, our support team issued 14 replacement eSIMs.
My iPhone says the eSIM is locked to another carrier. What now?
Your iPhone has a carrier lock: your home carrier tied it to its own plans. Check Settings › General › About. If “Carrier Lock” (UK: “Network Provider Lock”) shows “SIM locked”, the iPhone will not accept another provider’s eSIM. An unlocked iPhone shows “No SIM restrictions”.
- Who can unlock it: According to Apple, only the carrier your iPhone is locked to can remove the lock, and it can take a few days (Apple Support, unlock your iPhone).
- Other messages with the same cause: “Cellular Plans from This Carrier Cannot Be Added” and “This eSIM is not compatible with this iPhone”.
- “SIM Not Supported”: iOS 26 has this text too. Apple mentions the message in connection with an inserted SIM card from another carrier.
A network lock or a faulty phone was the cause in 6 of our 131 conversations. If the lock cannot be removed before your trip, message our support about a refund.
Why do I have to turn off a phone number?
An iPhone can have two lines active at the same time and store more. With two lines already on, iOS 26 asks “Choose Phone Number to Turn Off” and explains: “Only two phone numbers can be active at once.” Pick a line you do not need on the trip, such as an old travel eSIM. This came up in 2 conversations between 18 Sep and 7 Oct 2026.
“More Memory Required”: how many eSIMs fit on an iPhone?
Apple says you can “manage up to eight or more eSIMs” (Apple Support, set up eSIM on iPhone). Frequent travellers collect old profiles. Once the memory is full, iOS 26 reports “More Memory Required”. Delete an old, expired eSIM under Settings › Cellular › tap the line › “Delete eSIM”. Never delete the eSIM you are about to use: a deleted eSIM cannot be reinstalled.
I typed the code in by hand. Why does it say “Invalid Activation Code”?
For manual entry you tap “Add Cellular Plan”, then “Enter Details Manually”, and fill in two values: the SM-DP+ address and the activation code. Both are in your installation link. If the iPhone reports “Invalid Activation Code” or “Invalid SM-DP+ Address”, one character is usually wrong, a space slipped in, or the two fields are swapped. Copy the values instead of typing them.
Do I need Wi-Fi to add the eSIM?
Yes. Apple Support states that your new iPhone must be connected to a Wi-Fi network or hotspot (Apple Support, if you can’t set up an eSIM). We could not verify a separate, translated iOS 26 message for “no Wi-Fi”. If setup stops with “Unable To Continue Cellular Configuration”, check your Wi-Fi first. Install the eSIM at home; according to the product page, validity starts only in your destination.
When is it not your fault?
Some messages cannot be fixed with any setting. We say so openly:
- Carrier lock (6 cases with a network lock or faulty phone): only your home carrier can unlock the iPhone.
- Phone not eSIM-capable (4 cases): if “Add eSIM” is missing under Cellular, no eSIM can be installed.
- eSIM deleted: the code is used up, and every new scan ends with “This code is no longer valid”.
In these cases only a replacement eSIM or a refund helps. Message us via the chat on povnomad.com, on WhatsApp or in the POVNOMAD app, and send a screenshot of the message and of Settings › Cellular. This page is also available in German, French and Spanish. The steps with pictures are in our iPhone installation guide.
Frequently asked questions
What does “Unable to Activate eSIM” mean on an iPhone?
In our 12 cases with this message, the eSIM was usually already installed. Check the bottom line under Settings › Cellular. We looked up the wording in the iOS 26.7.1 texts on 1 November 2026.
Can I just scan the QR code again?
No. An eSIM code can be redeemed once. The second scan ends with “eSIM Cannot Be Added” and “This code is no longer valid”. Check under Cellular whether the line is already there.
How do I tell whether my iPhone is carrier-locked?
Under Settings › General › About, “Carrier Lock” shows either “SIM locked” or “No SIM restrictions”. According to Apple (as of 22 January 2026), only the carrier the iPhone is locked to can remove the lock.
How many eSIMs can be active on an iPhone at the same time?
Two. You can store more, up to eight or more according to Apple. If you try to switch on a third, iOS 26 asks you to “Choose Phone Number to Turn Off”.
Do I need Wi-Fi to add the eSIM?
Yes. Apple Support (as of 23 April 2026) says the iPhone must be connected to Wi-Fi or a hotspot. Install the eSIM at home; validity starts in your destination, according to the product page.
What do I do if I deleted the eSIM?
Message our support. A deleted code cannot be redeemed again, so you need a replacement eSIM. From 10 Feb to 7 Oct 2026 we issued 14 of them.
Where do the message texts come from, and how current are they?
From the English iOS 26.7.1 language files, looked up on 1 November 2026 at applelocalization.com, plus Apple Support. Case counts come from 131 WhatsApp conversations, 10 Feb to 7 Oct 2026. New iOS versions can change the wording.
📦 Matching eSIM plan: Our top-selling destinations in October 2026 were Turkey, Morocco and Indonesia with Bali. Every other country is in the eSIM store.
Last updated on 1 November 2026. Message texts checked in iOS 26.7.1 on 1 November 2026, support figures from 10 Feb to 7 Oct 2026. Wording can change with any iOS update.