eSIMratCarrier unlocking
by RonyCarrier unlocking means freeing a phone locked by the carrier that sold it so it accepts the SIM and eSIM of any operator. Carriers generally have to do it free on request. A locked phone will refuse to activate a travel eSIM, however perfectly installed: this is THE check to run before buying a plan.
Why it matters when travelling
The classic case: a phone bought subsidised with a plan, second-hand, or abroad (American and Japanese carriers lock a lot). Everything works at home with the original SIM… and the travel eSIM refuses to activate the night before departure. Unlocking takes anywhere from a few minutes to a few days depending on the carrier: do not leave it to the last evening.
Quick check on iPhone: Settings, General, About, the “Carrier Lock” line: “No SIM restrictions” means you are fine. On Android, the simplest test is to try another SIM, or to ask the original carrier.
The misconception
“Phones are never carrier-locked these days.”
Locking has become rare in Europe. But phones bought abroad (the United States and Japan above all), second-hand, or through some subsidised offers still can be. And it is precisely the traveller, buying third-party eSIMs, who discovers the lock: check before buying your plan, not after.
What it changes when you compare
No plan works around a locked phone: it is a prerequisite, not a comparison criterion. Good providers say so before purchase; some check compatibility by IMEI, which is the best protection against buying an unusable plan (often non-refundable once installed).
Compare eSIM plans by destination
The rat's tip: Buying a second-hand phone to travel with? Demand proof of unlocking before paying: “No SIM restrictions” shown in the settings, or a third-party SIM or eSIM tested in front of you. A locked phone can be resold; a non-refundable plan cannot.
See also
Frequently asked questions
How do I unlock my phone?
Ask the carrier that sold the phone (customer area, app or support): it is generally free. Unlocking is permanent and happens remotely, often automatically after connecting to the network or restarting.
How do I know whether my phone is locked?
On iPhone: Settings, General, About, the Carrier Lock line. On Android: insert another carrier's SIM (a friend's); if the phone asks for an unlock code or refuses the network, it is locked.
Can a locked phone still install an eSIM?
The profile install can sometimes go through, but the line will refuse to connect to the network: the lock applies to use, not only to the download. The outcome is the same: no connection. Unlock first, buy after.