Device eligibility is the readiness check before you buy Onyx mobile service. Your phone needs to support eSIM installation, work with the selected coverage area, and allow another mobile line where carrier lock rules apply. Check those pieces before checkout so activation can move from plan choice to service setup without a device mismatch.
Key Takeaways
Onyx mobile service uses eSIM activation on supported devices.
Coverage and device eligibility are different checks.
Your phone should support eSIM, compatible network bands, roaming, and the line settings the plan requires.
Some carrier-locked phones cannot activate another mobile line until the carrier unlocks them.
Use the app flow before deleting an installed eSIM or changing devices during activation.
Before You Start
Know the exact phone model and operating system.
Know where service needs to work. The selected coverage area matters because device bands and local network conditions can vary by country and region.
Know whether the phone came from a carrier. Carrier-sold devices can include lock rules that affect another mobile line.
Keep your coverage decision nearby. Device eligibility checks the phone. Coverage checks the places where service needs to work.
Check eSIM Compatibility
Your phone must support eSIM installation.
Use the device settings or manufacturer specifications to confirm support for your exact model. Regional variants of the same phone can behave differently, so check the model you actually own.
If your settings include an option such as Add eSIM, Add Cellular Plan, Add Mobile Plan, or SIM Manager, the phone likely supports eSIM setup. The exact label depends on the operating system.
If the setting does not appear, confirm the model, software version, and carrier lock status before checkout.
Check Unlocked Status
Some phones need to be unlocked before they can activate another mobile line.
If your phone came from a carrier, check carrier lock status in the device settings or through the carrier account that supplied the phone.
An unlocked phone gives Onyx a clear path to install service as another mobile line. A locked phone can block setup even when the device supports eSIM.
Check Network Bands And Coverage Fit
Coverage tells you where Onyx service can work. Device eligibility tells you whether your phone can carry that service.
Your phone should support the network bands used in the countries where you plan to use the selected coverage area. Check the manufacturer specifications for the exact phone model and region variant.
This matters most when you use an imported phone, a regional model, or a device that does not support the same bands in every country.
Check Roaming And Line Settings
After activation, your phone may need roaming enabled for the Onyx line.
Dual-SIM phones can also ask which line handles mobile data, calls, SMS, and default contacts. Review those settings before you depend on the connection.
If you keep another carrier line active, set the Onyx line for mobile data when you want Onyx to carry the connection. Keep the other line settings aligned with how you want calls and SMS to behave.
Use The Device Eligibility Checker
Use this checker before checkout. Mark an item for review when you need to confirm the setting, model, or carrier status first.
Device readiness
Device eligibility checker
Confirm the device signals that matter before you build your plan.
eSIM support
The phone can install an eSIM profile.
Unlocked status
The phone can activate another mobile line where carrier rules apply.
Network bands
The exact model supports the places where service needs to work.
Roaming settings
The phone can keep roaming enabled for the Onyx line.
Dual-SIM setup
You can choose which line handles data, calls, and SMS.
What You’ll See
The app can show device and activation progress through states such as:
device check
ready to install
installation available
activation in progress
connection active
needs attention
Use those states as the account view of setup. If your phone settings and the screen do not match, keep the service in place and review the setup guide before changing the device.
When To Escalate
Most device eligibility questions should be resolved before checkout through device settings, manufacturer specifications, carrier unlock status, and the eligibility checker above.
Do not delete an installed eSIM or change devices during activation unless the app flow tells you to do so. Deleting the eSIM can interrupt recovery or require reactivation.
Escalate only when service is active in the app, the device settings are aligned, and the issue appears to be a network-level service condition rather than a device-readiness question.
If escalation becomes necessary, include the phone model, operating system, selected coverage area, active service state, current country, and a screenshot of relevant settings if it helps. Do not send one-time codes, full card details, private keys, seed phrases, recovery phrases, signing approvals, or wallet backup material.
FAQ
How do I check device eligibility for Onyx mobile service?
Check eSIM support, unlocked status where required, compatible network bands, roaming settings, and dual-SIM behavior before checkout.
Is eSIM compatibility the same as Onyx coverage?
No. Coverage tells you where service can work. Device eligibility tells you whether your phone can install and carry the service.
Does my phone need to be unlocked?
Some phones need to be unlocked before they can activate another mobile line. Check carrier lock status before checkout if your device came from a carrier.
Why do I not see an eSIM option in settings?
The phone model, software version, carrier lock, or regional device variant may not expose eSIM setup. Confirm the exact model and operating system before checkout.
Can dual-SIM settings affect Onyx activation?
Yes. Dual-SIM phones can keep multiple lines, but you may need to choose which line handles mobile data, calls, SMS, and roaming.
Should I delete an installed eSIM if setup needs review?
No. Use the app flow first. Deleting an installed eSIM can interrupt recovery or require reactivation.
Related Guides
Step 1
Check eSIM support
Confirm that your phone supports eSIM installation.
Step 2
Check unlocked status
Confirm that the phone can activate another mobile line where carrier lock rules apply.
Step 3
Check network bands
Match the phone model and region variant to the places where service needs to work.
Step 4
Check roaming and line settings
Confirm that the phone can keep roaming enabled and select the Onyx line for mobile data.
Step 5
Review before device changes
Use the app flow before deleting an installed eSIM or changing devices during activation.
Frequently asked questions
How do I check device eligibility for Onyx mobile service?
Check eSIM support, unlocked status where required, compatible network bands, roaming settings, and dual-SIM behavior before checkout.
Is eSIM compatibility the same as Onyx coverage?
No. Coverage tells you where service can work. Device eligibility tells you whether your phone can install and carry the service.
Does my phone need to be unlocked?
Some phones need to be unlocked before they can activate another mobile line. Check carrier lock status before checkout if your device came from a carrier.
Why do I not see an eSIM option in settings?
The phone model, software version, carrier lock, or regional device variant may not expose eSIM setup. Confirm the exact model and operating system before checkout.
Can dual-SIM settings affect Onyx activation?
Yes. Dual-SIM phones can keep multiple lines, but you may need to choose which line handles mobile data, calls, SMS, and roaming.
Should I delete an installed eSIM if setup needs review?
No. Use the app flow first. Deleting an installed eSIM can interrupt recovery or require reactivation.
Ready to build your plan?
Choose coverage, data, and number options after confirming your device can carry the service.