The eSIM appears under Cellular but the transferred line cannot register after phone migration. The following process separates a transient symptom from a repeatable configuration or compatibility issue without relying on a full reinstall.
Start with the evidence
Primary symptom. The eSIM appears under Cellular but the transferred line cannot register after phone migration. Record the precise point of failure and whether the same input, account or connected device succeeds in another supported mode. That working comparison establishes the scope of the repair.
Where this failure originates
The first hypothesis is a mismatch in the failing path. Check the active line, carrier settings and whether the old handset still has the active profile. The second is a lower-level state that the interface may not show: compare IMEI/eSIM compatibility, network-selection status and carrier provisioning windows. A third possibility is a feature or version limitation, which should be checked against supported documentation before a reset.
For this iOS issue, capture iOS version, hardware model, region and managed settings and compare the same iPhone under a second permitted feature configuration. Preserve the last known working configuration so you can tell whether a successful retry came from an actual correction or a temporary recovery.
Pick the right branch
| What you observe | What it suggests | Focused response |
|---|---|---|
| The eSIM appears under Cellular but the transferred line cannot register after phone migration | The failure affects the specific workflow described here; the entire system is not necessarily broken. | Check the active line, carrier settings and whether the old handset still has the active profile. |
| The basic comparison exposes a difference between a working and failing configuration. | A local setting, version, account context or device route deserves attention. | Request carrier-side transfer completion or reprovisioning before deleting any eSIM. |
| The same failure persists after a reversible correction. | A deeper dependency or compatibility issue may remain. | Compare IMEI/eSIM compatibility, network-selection status and carrier provisioning windows. |
Before changing anything: Do not delete the only functioning eSIM without a carrier recovery plan. Save a screenshot or anonymized log line, record the previous setting, and back up relevant user data. Do not reset every related service just because one test fails.
Choose a recovery route. The Beginner path checks check the active line, carrier settings and whether the old handset still has the active profile. The Advanced path investigates compare IMEI/eSIM compatibility, network-selection status and carrier provisioning windows. They address different evidence; use the path that matches your result.
Step-by-Step Troubleshooting
Choose the Beginner route for reversible checks or Advanced for evidence-driven diagnosis.
Capture the reproducible symptom
The eSIM appears under Cellular but the transferred line cannot register after phone migration. Before editing settings, note the exact time, affected account or device, and whether it started after an update, move, hardware change or network change. This is the baseline for the iPhone eSIM Transfer Completes but Mobile Data Says No Service guide.
Check the active line, carrier settings and whether the old
Check the active line, carrier settings and whether the old handset still has the active profile. Observe whether the symptom changes. A clean comparison tells you which part of the process is healthy and avoids unnecessary resets.
Adjust carrier-side transfer completion or reprovisioning before
Request carrier-side transfer completion or reprovisioning before deleting any eSIM. Change only this variable, record its former value, and try the failing action once. If there is no improvement, restore the prior configuration before exploring the Advanced route.
Verify the new iPhone places calls and uses cellular data with
The new iPhone places calls and uses cellular data with the intended number. Repeat using the same account, network, file, title or hardware condition that previously failed. Do not count a different test as confirmation.
Inspect supporting logs
Collect the error text or state relevant to iPhone eSIM Transfer Completes but Mobile Data Says No Service. Record iOS version, hardware model, region and managed settings; anonymize account IDs, public IPs and secret-bearing log fragments before sharing.
Inspect iMEI/eSIM compatibility, network-selection status and
Compare IMEI/eSIM compatibility, network-selection status and carrier provisioning windows. Record the difference between successful and failed cases and keep the first meaningful error rather than the last cascade message.
Rule out related configuration drift
Where practical, compare the same iPhone under a second permitted feature configuration. If the alternate case works, return to the single configuration difference instead of changing multiple services. Use the vendor-supported method for your current version.
Verify and record results
The new iPhone places calls and uses cellular data with the intended number. Leave the previous value documented for rollback, then monitor one normal operating cycle. If symptoms recur, attach the sanitized evidence to a vendor or administrator support request.
After your guided checks
After the first corrective action, interpret the result carefully. If the original task now works, leave the other settings unchanged. If it still fails, compare IMEI/eSIM compatibility, network-selection status and carrier provisioning windows. Compare the same iPhone under a second permitted feature configuration rather than adding random fixes on top of one another.
For escalation, retain iOS version, hardware model, region and managed settings, the original output, and a single before/after comparison. Redact passwords, tokens and personal data. A support agent can then distinguish the same iPhone under a second permitted feature configuration from a general outage without repeating risky actions.
Acceptance test
Pass condition: The new iPhone places calls and uses cellular data with the intended number. The validation must exercise the same path that failed originally. A successful settings screen, single ping, application homepage or idle system is not enough if the original failure appears during a different action.
Repeat the test under the original conditions once after a safe relaunch, reconnect or new session. For intermittent failures, record the time and the difference between a clean result and a failed one instead of claiming success from a single attempt.
When to escalate
If the problem persists, restore any test-only settings, preserve the evidence and stop before destructive reset, firmware flash or credential recreation. Give official support the exact symptom, the first failing timestamp and what the comparison established. Do not delete the only functioning eSIM without a carrier recovery plan.
Prevent recurrence: Document the working correction: Request carrier-side transfer completion or reprovisioning before deleting any eSIM. Retain the accepted result (the new iPhone places calls and uses cellular data with the intended number) as a future regression test after configuration, software or hardware changes.
Solution Checklist
Questions specific to this fault
How do I know the symptom is actually resolved?
The new iPhone places calls and uses cellular data with the intended number. A generic diagnostic test outside the affected workflow is not a substitute.
Should I reset or reinstall everything first?
No. Check the active line, carrier settings and whether the old handset still has the active profile. Then choose the smallest supported intervention: request carrier-side transfer completion or reprovisioning before deleting any eSIM. Preserve recoverable settings and user data.
What should I include in a support request?
Provide the exact failing action, product and version, time, non-sensitive log evidence, and this deeper observation: Compare IMEI/eSIM compatibility, network-selection status and carrier provisioning windows. Do not include credentials or private customer data.