Roaming Shows Signal but Mobile Data Does Not Work

Start with “Data roaming on the intended line”

Record the change that preceded the problem, where it occurs, the affected app, and the active connection. Holding test conditions constant helps distinguish intermittent service trouble from a persistent configuration issue.

• Data roaming on the intended line
• Partner carrier and manual selection
• APN and carrier settings
• Roaming cap or account suspension

Treat connectivity as four layers: the phone, the SIM or eSIM, carrier provisioning, and the local network. After changing a setting, toggle airplane mode or restart, then retest in the same location under the same network conditions.

Separate “Data roaming on the intended line” from “Partner carrier and manual selection”

Diagnostic order for Roaming Shows Signal but Mobile Data Does Not Work

Test one variable at a time

Test one item at a time. After checking “Data roaming on the intended line,” repeat the same test before moving to “Partner carrier and manual selection.” Stop as soon as Roaming Shows Signal but Mobile Data Does Not Work works again and record the last change.

1. 1
   Record when Roaming Shows Signal but Mobile Data Does Not Work occurs and capture “Data roaming on the intended line” and “Partner carrier and manual selection” at that moment. Save the exact warning text without exposing passwords or activation secrets.
2. 2
   Restart normally, then check only updates that can affect Roaming Shows Signal but Mobile Data Does Not Work. If the behavior began after an update, preserve that before/after timing as part of the diagnosis.
3. 3
   Use Settings search to open “Data roaming on the intended line.” Record its current value and whether automatic configuration is enabled before making a change.
4. 4
   Inspect “Partner carrier and manual selection,” then compare another network, SIM, app, accessory, or user profile to determine whether the failure follows the phone or the service.
5. 5
   Confirm that “APN and carrier settings” and “Roaming cap or account suspension” meet device, plan, region, permission, and management requirements. A missing menu can indicate that the feature is not provisioned.
6. 6
   Change only one of “Data roaming on the intended line” or “Partner carrier and manual selection,” then repeat the same test. Do not combine resets because that would erase the evidence for Roaming Shows Signal but Mobile Data Does Not Work.
7. 7
   If Roaming Shows Signal but Mobile Data Does Not Work still fails, collect “Data roaming on the intended line,” “Partner carrier and manual selection,” “APN and carrier settings,” the model/OS build, and the exact reproduction steps before contacting the provider responsible for that layer.

What to inspect when the basic checks do not explain it

Treat connectivity as four layers: the phone, the SIM or eSIM, carrier provisioning, and the local network. After changing a setting, toggle airplane mode or restart, then retest in the same location under the same network conditions.

• Data roaming on the intended line: Check not only the menu value but also plan eligibility, permissions, management state, and the remote endpoint.
• Partner carrier and manual selection: Check not only the menu value but also plan eligibility, permissions, management state, and the remote endpoint.
• APN and carrier settings: Check not only the menu value but also plan eligibility, permissions, management state, and the remote endpoint.
• Roaming cap or account suspension: Check not only the menu value but also plan eligibility, permissions, management state, and the remote endpoint.

Do not erase the evidence before isolating the cause

• For Roaming Shows Signal but Mobile Data Does Not Work, do not copy configuration values or profiles from an unverified source.
• Do not bulk-delete networks, accounts, certificates, or profiles while diagnosing Roaming Shows Signal but Mobile Data Does Not Work; first identify whether “Data roaming on the intended line” or “Partner carrier and manual selection” is involved.
• Do not erase the phone or disable account protection for Roaming Shows Signal but Mobile Data Does Not Work until recovery access and the effect on “Data roaming on the intended line” are confirmed.

Keep the evidence needed for the next occurrence

• Keep a short change log for Roaming Shows Signal but Mobile Data Does Not Work, including the value of “Data roaming on the intended line,” incident dates, and update dates.
• If Roaming Shows Signal but Mobile Data Does Not Work involves account recovery, keep recovery codes and essential account details outside the phone in a secure location.
• Before major updates that could affect Roaming Shows Signal but Mobile Data Does Not Work, verify backups and compatibility for “Data roaming on the intended line” and “Partner carrier and manual selection.”