The hotel has sent the room code via Messages, but the thread has turned green and replies are coming from an unfamiliar email address. Mobile data is working, maps load, and the travel eSIM shows connected, yet contacts no longer see the usual Australian number. Before you consider switching to another TravelKon travel eSIM plan, note that changing plans is rarely the first fix for this issue. Instead, start by checking iMessage settings.
How to Check Why iMessage Isn’t Working on a Travel eSIM
Open Settings > Apps > Messages > Send & Receive and make sure the usual Australian number or intended Apple Account email is selected. Then choose the travel eSIM under Settings > Mobile/Cellular > Mobile Data so it carries the internet connection without replacing the identity used by iMessage. Do not delete either eSIM as a first step.
Identify What Changed Before the Problem Occurred
The correct fix depends on the type of eSIM change that happened before iMessage stopped working.
| What Changed? | Likely Problem | First Check |
|---|---|---|
A separate travel data eSIM was added | Sender or mobile-data selection changed | Send & Receive and Mobile Data |
The Australian number was converted from physical SIM to eSIM | Carrier provisioning or number activation failed | Activation status and home carrier |
The Australian number was transferred or converted and both profiles remain | An inactive profile may duplicate the number | Send & Receive and SIM settings |
Only one conversation is green | Recipient or conversation-specific routing | Start a new conversation after checking the sender |
Separate the Number, Data Line, and Activation SMS
Keep three settings separate: Send & Receive controls the number or email contacts see, Mobile Data controls the internet connection, and the Australian carrier line handles phone-number activation SMS. Send as Text Message can turn a failed blue iMessage into a carrier SMS.
A data-only eSIM can carry iMessage without supplying a number. The Australian number can remain the identity while the travel eSIM supplies data. A seemingly changed number is therefore usually a selection issue.
Double-Check Send & Receive Selections
Use the current iPhone path:
- Open Settings.
- Tap Apps > Messages.
- Confirm that iMessage is on.
- Tap Send & Receive.
- Under You Can Receive iMessages To and Reply From, select the Australian number and any Apple Account email addresses that should receive messages.
- Under Start New Conversations From, choose the Australian number if contacts should see that number on new conversations.
Older iOS versions may show Settings > Messages without Apps. Do not deselect the Australian number merely because the travel eSIM handles data.
If Messages Are Coming from an Email Address
The Apple Account email is probably selected under Start New Conversations From, or the phone number has not completed activation. Select the Australian number if it is available and ticked.
If the number is grey, spinning or missing, do not repeatedly sign out. Check activation below, then start one test conversation after the correct selection appears.
And if preserving the Australian number is not essential, or the carrier cannot activate it overseas, select a verified Apple Account email under both Send & Receive sections. New contacts will see that email rather than the phone number. This can create separate conversation threads, and messages addressed only to the Australian number may not reach the email-based identity.
If Messages Are Green Instead of Blue
A green bubble is an SMS or RCS message, not iMessage. This can happen because iMessage is unavailable, the recipient is not using iMessage, the data connection has failed or Send as Text Message has converted a failed iMessage into carrier SMS.
Turn off Wi-Fi and load a new webpage. If the page does not open, repair the travel eSIM’s data connection before changing Messages settings. However, if data works, check iMessage activation and Send & Receive.
If every Apple conversation is green, check activation and Apple’s System Status page. But if only one is affected, the recipient may have disabled iMessage or changed devices. A number also missing from FaceTime indicates an activation fault.
Keep the Home Line Available Only Where Appropriate
If keeping the usual Australian number on iMessage is important, leave that SIM or eSIM enabled while assigning mobile data to the travel eSIM. Keeping the home line on does not mean it should carry data.
Open Settings > Mobile/Cellular, tap the Australian line and:
- Keep Turn On This Line enabled.
- Turn Data Roaming off unless the Australian carrier’s plan specifically requires it.
- Check the carrier’s international roaming, incoming SMS, call and voicemail terms.
Receiving SMS is often free, but not universally. Calls, outgoing texts, voicemail and roaming passes can create charges. Check how to avoid roaming charges overseas before relying on the home line.
If avoiding all home-carrier activity matters more than number continuity, turn the Australian line off and use a verified Apple Account email for iMessage. Check Send & Receive after changing either line.
Choose the Travel eSIM for Mobile Data
- Open Settings > Mobile/Cellular.
- Tap Mobile Data or Cellular Data.
- Select the travel eSIM.
- Turn Allow Mobile Data Switching off unless the setup instructions require it.
- Open the travel line and enable Data Roaming only if required by that plan.
Most of our plans are data-only, although selected products include calls or texts. That said, always check the product inclusions. You can still make calls with a data-only eSIM through supported internet calling apps.
Switch off Wi-Fi, open a webpage, then send a new iMessage to a known Apple user. A blue message confirms travel-data use; it does not prove SMS fallback is free.
Handle Activation SMS and Possible Roaming Charges
Phone-number activation is different from sending an ordinary iMessage. Blue messages use internet data after activation, but verifying a phone number can send an SMS through the carrier associated with that number. That SMS may be chargeable overseas.
Fix Waiting for Activation
If iMessage Activation Unsuccessful, Waiting for Activation or a similar message appears:
- Connect to working Wi-Fi or travel-eSIM data.
- Set Settings > General > Date & Time > Set Automatically.
- Confirm that the Australian line can send international SMS and has sufficient credit or an active service.
- Open Settings > Apps > Messages, turn iMessage off, restart the iPhone and turn iMessage back on once.
- Wait for verification. Phone-number activation can take up to 24 hours.
Oni OS 26, iMessage may not activate automatically when an eSIM is added after initial setup. Turning iMessage off and back on triggers the missing step.
Check for a Duplicate Number in iOS 26
If the same phone number appears twice in Send & Receive, an inactive duplicate SIM may be blocking activation. Update to iOS 26.1 or later, then remove only the confirmed inactive duplicate. Do not delete the working Australian line or travel eSIM simply because several profiles appear.
Prevent Chargeable SMS Fallback
Open Settings > Apps > Messages and consider turning off Send as Text Message while overseas. This prevents a failed blue message from automatically becoming a potentially chargeable green SMS. Carrier terms still control activation-SMS, call, voicemail and roaming-pass charges.
Know When to Contact Support
Contact the Australian carrier if the number remains unticked after the activation window, international SMS cannot be sent, the line is barred or activation charges are unclear. Only contact our support team if the travel eSIM itself has no working data. Contact Apple support if data works, the correct number or email is selected and iMessage still fails.
If the travel profile does not appear under Settings > Mobile/Cellular, check whether your iPhone supports eSIM before using the guide to install an eSIM on iPhone. Do not reinstall a profile that already appears in settings.
Provide the iPhone model, iOS version, error, Send & Receive status and Wi-Fi-off test result. Never share the QR code, activation code or full ICCID publicly.
FAQs
Does iMessage Work Overseas with a Travel eSIM?
Yes. Once activated, iMessage can use travel-eSIM data or Wi-Fi. The selected Australian number or Apple Account email controls the identity that contacts see.
Will Installing a Travel eSIM Change the iMessage Number?
No. The sender changes only if Send & Receive selects another identity or the Australian number loses activation.
Can iMessage Work on a Data-Only eSIM?
Yes. The travel eSIM supplies data while iMessage uses the selected number or Apple Account email.
Why Are Messages Being Sent from an Email Address?
The email is selected under Start New Conversations From, or the phone number is not activated. Select the number if available; otherwise, complete activation.
Can Keeping the Australian SIM Enabled Cause Roaming Charges?
Yes. Charges can arise from outgoing SMS, calls, voicemail, home-line data or a triggered roaming pass. Assign data to the travel eSIM, disable data roaming and automatic data switching for the Australian line, then check the home carrier’s terms.
