Not always. The cause could be something else entirely — an activation code that has already expired or been used once, an unstable internet connection during installation, or a step done out of order. Read the exact message the phone shows before concluding it is a lock issue.

No. Unlocking is entirely in the hands of the operator that originally sold the device. We can help check and explain the symptoms found, but we have no access to that phone's own lock system.

The most direct way is to try inserting a physical SIM from a different network first. If it works normally, that is a good sign the phone is unlocked. Or test-install an eSIM profile ahead of the day it is actually needed.

A phone with no eSIM support simply has no eSIM chip at all, so no amount of unlocking changes anything. A locked phone has the chip and genuinely supports eSIM, but its software has been set to reject any profile that is not from its original network.

The remaining options are usually limited to buying a local physical SIM if the phone has a tray and does not also reject physical SIMs, or contacting the original operator remotely to request an emergency unlock. Message the team on LINE or by email if help is needed separating a genuine lock from another problem.

Yes, since the lock operates at the level of the phone's modem, which serves both SIM slots. If the phone is locked, keeping a Thai number on the physical SIM while trying to install a foreign eSIM alongside it will typically fail the same way.