How to Transfer eSIM to iPhone 18 Pro Max or iPhone Ultra: Setup & Activation Fixes
Last updated: August 24, 2026
Quick Answer
To move your phone number to an iPhone 18 Pro Max or iPhone Ultra, approve the eSIM transfer when Quick Start displays the cellular setup screen. Although both phones use the same iOS process, the eSIM is authorized separately from photos, apps and other data.
If you skipped that screen, go to Settings > Cellular > Add eSIM > Transfer From Nearby iPhone. Keep the old iPhone nearby and unlocked, then approve the request.
The previous SIM stops working after the plan activates on the new device. Test calls, SMS and cellular data before erasing your old iPhone.
Does Data Transfer Also Move the eSIM?
Only if you separately approve the cellular transfer. Quick Start can present both tasks during the same setup session, but they are not the same operation.
Your photos, messages, apps and settings can move through Quick Start or a backup. Your phone number belongs to a carrier-managed cellular plan, so the carrier must authorize the new eSIM profile.
| Setup Item | How It Moves | What You Must Confirm |
|---|---|---|
| Apps, photos, messages and settings | Quick Start, iCloud restore or computer backup | Complete the content migration |
| Phone number and cellular plan | eSIM Quick Transfer, QR code or carrier activation | Authorize the number on the old phone or carrier account |
| Physical SIM from an older iPhone | Physical-SIM-to-eSIM conversion | Check that the carrier supports conversion |
This is why an iPhone 18 Pro Max or iPhone Ultra can finish downloading apps and photos while still displaying SOS or No Service.
How Do You Transfer eSIM to iPhone 18 Pro Max or iPhone Ultra?
The steps are the same on iPhone 18 Pro Max and iPhone Ultra because eSIM transfer is handled by iOS.
Before you begin, prepare both phones:
- Both iPhones signed in with your Apple Account
- The old iPhone unlocked with its device passcode
- Both phones placed nearby with Bluetooth turned on
- Both devices running iOS 18.4 or later
- A carrier and plan that support eSIM transfer
- Place the old iPhone beside the iPhone 18 Pro Max or iPhone Ultra.
- Begin Quick Start and continue to the cellular setup screen.
- Select the phone number that you want to move.
- Tap Transfer on the old iPhone.
- Enter the verification code displayed on the new phone if asked.
- Wait until the carrier name and signal appear.
- Make a call and test cellular data with Wi-Fi off.
When the transfer succeeds, the same phone number becomes active on the new device and inactive on the old one.
Can You Transfer eSIM After Setup Is Complete?
Yes. There is no need to erase the iPhone 18 Pro Max or iPhone Ultra or repeat the data migration.
- Open Settings on the new device.
- Tap Cellular.
- Tap Set Up Cellular or Add eSIM.
- Select an available phone number or tap Transfer From Nearby iPhone.
- Approve the transfer on the old iPhone.
- Complete any carrier webpage or verification step that appears.
Tap Finish Setting Up Your Carrier’s Cellular Plan if that banner appears. Complete the carrier sign-in or account-verification screen before testing service.
Does Your U.S. Carrier Support eSIM Quick Transfer?
Apple lists AT&T, T-Mobile and Verizon among the U.S. carriers supporting eSIM Quick Transfer. Cricket, Consumer Cellular, Spectrum, UScellular and Xfinity Mobile are also listed.
Some prepaid, business, managed or security-locked accounts may still require a carrier login, one-time PIN or support request.
If Transfer From Nearby iPhone does not appear, use one of these carrier-supported alternatives:
- eSIM Carrier Activation assigned digitally by the carrier
- A carrier QR code or activation link
- The carrier’s official app or online account
- Manual eSIM details supplied by customer support
How Do You Move a Physical SIM to an eSIM-Only iPhone?
If the old iPhone uses a physical SIM, select that phone number during cellular setup. A supported carrier can convert the line to an eSIM while it moves to the iPhone 18 Pro Max or iPhone Ultra.
Approve the conversion on the old phone and wait for activation. The physical SIM stops providing service once the new eSIM is active.
If the conversion option is missing, contact the carrier and ask it to activate your number using the new iPhone’s IMEI or EID.
Why Does a U.S. iPhone 18 Pro Max or iPhone Ultra Have No SIM Card Slot?
U.S. eSIM-only iPhones activate cellular service digitally and do not require a removable SIM tray.
If your iPhone 18 Pro Max or iPhone Ultra has no SIM card slot, use Quick Transfer, a carrier activation, a QR code or the carrier app. Do not try to open the microphone holes or other parts of the frame.
SIM configurations can differ by country. Check the device’s sales region when buying or importing an iPhone.
How Do You Fix eSIM Not Activating on iPhone 18 Pro Max or iPhone Ultra?
Keep the old phone and its active cellular line available while troubleshooting. Deleting the old eSIM does not force the new one to activate.
Then try these steps in order:
- Connect the new iPhone to stable Wi-Fi.
- Install the latest available iOS update on both phones.
- Turn Airplane Mode on, wait briefly and turn it off.
- Open Settings > Cellular. If the line appears, turn it off and back on.
- Restart the new iPhone.
- Open Settings > General > About and install any carrier settings update.
- Return to Settings > Cellular > Add eSIM and retry.
If activation still fails, contact the carrier with your phone number, account PIN, exact error message and the new device’s IMEI or EID. Find those identifiers under Settings > General > About.
If the message says the eSIM is invalid, incompatible or unsupported, the carrier normally needs to correct the account or issue a new eSIM profile.
Can You Transfer eSIM From Android to iPhone 18 Pro Max or iPhone Ultra?
Yes, when the Android device and carrier support Apple’s direct transfer process.
Apple currently lists AT&T, Cricket, FirstNet, T-Mobile, Verizon and Xfinity Mobile among the supported U.S. carriers for Android-to-iPhone eSIM transfer.
If the option is available, open Settings > Cellular > Set Up Cellular or Add eSIM, select Transfer From Android and follow the QR-code prompts. If the carrier or Android device is not supported, contact the carrier for a QR code or digital activation.
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Frequently Asked Questions
Does transferring iPhone data also transfer the eSIM?
Quick Start can show the eSIM transfer during setup, but you must approve it separately. Restoring apps and photos alone does not activate the cellular plan.
Do iPhone 18 Pro Max and iPhone Ultra use the same eSIM steps?
Yes. Both devices use the same iOS menus: Settings > Cellular > Add eSIM. Available activation choices still depend on the carrier.
Can I transfer eSIM after finishing iPhone setup?
Yes. Open Settings > Cellular > Add eSIM and choose Transfer From Nearby iPhone. Your existing apps and photos do not need to be transferred again.
Why is Transfer From Nearby iPhone missing?
The carrier or plan may not support Quick Transfer, or the devices may not meet Apple’s account, Bluetooth and software requirements. Use the carrier app, a QR code or support instead.
Can the same phone number stay active on both iPhones?
No. The previous SIM is deactivated when the number successfully activates on the iPhone 18 Pro Max or iPhone Ultra.
What if my old iPhone is broken or unavailable?
Use the carrier’s app or account portal, or contact support for a replacement eSIM. Have the new phone’s IMEI or EID and your account PIN ready.
Why does my U.S. iPhone have no SIM card slot?
An eSIM-only iPhone activates the cellular plan digitally. Use Add eSIM in Settings or complete activation through the carrier instead of inserting a physical card.
Should I erase the old iPhone after transferring the eSIM?
Wait until the new phone can make calls, receive texts and use cellular data. Verify banking and two-factor authentication messages before erasing the old device.
