SIM not supported: what the message means when you add a travel eSIM
The alert that a SIM does not appear to be supported is the message Apple quotes for an iPhone that is still locked to an operator. On Android the same situation usually shows up as a request for a network unlock code. Neither is fixed in Settings: only the operator that locked the phone can lift the lock, and Apple warns it can take a few days.
Check if my phone is compatibleThe wording, and the lock behind it
Apple's article on unlocking an iPhone shows the alert that a locked phone gives with another operator's SIM: the card does not appear to be supported, and only compatible SIM cards from a supported carrier can be used to activate the iPhone. Apple explains what sits behind it in its SIM troubleshooting: if an iPhone is locked to a carrier, it can only be used with that carrier.
A lock is a setting on the operator's side tied to the phone, not to a card, so it applies to any line you add, physical or eSIM. You can see it in Settings, General, About, in the Carrier Lock row. No SIM restrictions means unlocked; anything else means the phone still belongs to one network. Our guide on checking whether a phone is unlocked covers that row and the Android checks in detail.
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Will it work on my phone?
On iPhone: Settings → General → About, and scroll to EID. If there is an EID, your phone takes eSIMs. Every iPhone from the XS (2018) onwards does.
On Android: Settings → About phone → Status, and look for EID. If there is an EID, your phone takes eSIMs. Most Galaxy S20, Pixel 3 and later do.
It also has to be carrier-unlocked. If you bought it outright or your contract is over, it almost certainly is.
Not sure about your model? Ask us before you pay and we will tell you — a person answers within 24 hours.
How it works
- 1Choose and payCard, Apple Pay or Google Pay. No account.
- 2Install it at homeThe QR arrives by email. Scan it on wifi in a minute.
- 3Connect when you landTurn on data roaming for the eSIM and you are online.
Why a travel eSIM runs straight into it
Apple's dual SIM page puts it in one sentence: to use two carriers, your carrier must unlock your iPhone, or both plans must come from the same carrier. A travel eSIM is, by definition, from a different provider than the one you use at home. On a locked phone it is turned away no matter what you switch on.
What exactly you see depends on the moment. The supported-SIM alert is worded for a card, so with an eSIM the refusal can also appear as an error while adding the plan. In every case the giveaway is the same: the phone accepts your usual line and rejects anything else. That is also why changing the APN, the network or the roaming setting makes no difference here.
On Android: a code request instead of an alert
Samsung is explicit that it does not lock any of its devices to a particular network. When a Galaxy is locked, the lock was set by the provider that sold it, and Samsung's support page for a phone asking for an unlock code tells you to contact that original provider or retailer to request one. It adds that some providers do this free or for a small charge and others may not unlock at all.
Do not confuse that request with the SIM PIN. Samsung treats the SIM card lock as a separate setting that protects a card from being used in other devices, and its default PIN comes from the network provider. A PIN request after a restart says nothing about whether the phone is locked to an operator; a request for an unlock code when you add another operator's line does.
Second-hand phones and phones bought abroad
Apple states that it cannot unlock an iPhone for use with a different carrier; only the current carrier can. That rule matters most when the phone came to you second-hand. The lock belongs to the operator the phone was first sold through, so the request has to go to that operator, not to the person who sold it to you or to the manufacturer.
Phones bought in another country add a second question: whether the model takes an eSIM at all where it was sold. Apple notes, for example, that eSIM on iPhone is handled differently in China mainland. Our guide to phones bought in China or Hong Kong covers those cases, and the compatibility page lists models by name.
What to do with the eSIM you already bought
Get the unlock first, and do it before the trip: Apple says the operator can take a few days to process it. Once Carrier Lock reads No SIM restrictions, Apple's instructions are to set up the eSIM from the other carrier as usual.
If the travel eSIM never got onto the locked phone, nothing has been used and it can go on another phone that is unlocked and takes eSIM. If it did install, a Snoozim eSIM stays on the phone where it was installed, so do not delete it to try elsewhere, and write to us with your order email and phone model before erasing or restoring anything. If the problem turns out to be on the service side, we fix it or replace the eSIM.
Can Apple or Samsung unlock my phone?
No. Apple says only the carrier can unlock an iPhone, and Samsung says it does not lock its phones; the provider that sold the phone has to lift the lock.
Can I bypass the message in Settings?
No. The lock is applied by the operator, so no setting on the phone removes it. Changing the APN, network or roaming does not help.
How long does an unlock take?
It depends on the operator. Apple warns it can take a few days, so ask well before you travel.
Is a SIM PIN request the same as a carrier lock?
No. The SIM PIN protects a card after a restart; a carrier lock ties the whole phone to one operator's network.
Get your eSIM before you fly: the QR arrives by email in minutes and the plan only starts when you connect at your destination.
Check if my phone is compatible