Does a travel eSIM work on a carrier-locked phone? Usually not — here is how to check
Key facts
- A carrier-locked phone generally rejects travel eSIMs, because the lock blocks every network except your home carrier's.
- Dial *#06# and look for an EID to confirm the phone has eSIM hardware — that check is separate from the carrier lock.
- Request a carrier unlock days before departure; processing time varies and cannot be rushed at the airport.
- Once unlocked, a VoaSim eSIM with truly unlimited data costs USD 18.90 for 5 days, up to USD 106.90 for 60 days, at the same price in 170 destinations.
- If your eSIM installs but shows no signal, the free eSIM Rescue tool at voasim.com/sos/ diagnoses any brand of eSIM.
Check if your phone has eSIM
Two different things get confused all the time: eSIM support (does your phone have the chip?) and carrier lock (will your phone accept another network?). A phone can have eSIM hardware and still refuse a travel eSIM because the carrier locked it.
This guide walks through both checks in order, shows what an actual lock error looks like, and explains what to do when you are already abroad with no signal.
What a carrier lock actually does
When you buy a phone on an installment plan or a subsidized contract, the carrier often locks it to its own network. The lock lives in the phone's software, not in the SIM tray, so it applies to both the physical SIM and any eSIM profile you try to add.
That means you can sometimes download a travel eSIM QR code without any error, see the line appear in your settings, and still get no service at the destination. The profile installed; the network was rejected.
Two more nuances worth knowing:
- Some phones are locked but will still accept a foreign network after a set number of months on the plan — this depends entirely on the carrier's own policy.
- Phones bought outright, from the manufacturer's own store, or second-hand from another country are often already unlocked. Never assume; always check.
If your phone is unlocked and eSIM-capable, a VoaSim travel eSIM connects automatically to local networks on 4G and, where available, 5G.
Step 1: check the eSIM hardware with *#06#
Do this before anything else. Open the dialer and type *#06#. A screen of identifiers appears. Look for a line called EID — a long 32-digit number, sometimes with a QR code next to it.
- EID shown → your phone has eSIM hardware. Move on to the lock check.
- No EID → the phone cannot run an eSIM at all, locked or not. You would need a different handset.
As a general reference, eSIM works on iPhone XR or newer, Samsung Galaxy S20 or newer, Google Pixel 3 or newer, and most phones released from 2020 on. The *#06# test beats any list, because carrier-specific variants of the same model sometimes ship without eSIM.
VoaSim does not sell physical SIM cards, so an eSIM-capable, unlocked phone is a hard requirement. Full details in our setup guides.
Step 2: confirm whether the phone is carrier-locked
There is no universal code for this one. Use any of these, in order of reliability:
- Ask the carrier. Call support or open the carrier app and ask directly: "is this IMEI unlocked for use with other networks?" Have the IMEI ready — it is on the same *#06# screen.
- Check the phone settings. On many iPhones, Settings → General → About shows a "Carrier Lock" line. "No SIM restrictions" means unlocked.
- Borrow a SIM from a different carrier. If it registers on the network and makes a call, the phone is unlocked.
If it turns out locked, ask the carrier to unlock it. Most will do it once the device is paid off and the account is in good standing. Processing can take days, so start well before departure — not the night before your flight.
Prices once your phone is unlocked
VoaSim charges one price per duration, the same for every one of its 170 destinations. No per-country pricing, no GB packages to calculate, no throttling after a hidden threshold.
| Plan | Price | Per day |
|---|---|---|
| 5 days | USD 18.90 | USD 3.78 |
| 7 days | USD 23.90 | USD 3.41 |
| 10 days | USD 30.90 | USD 3.09 |
| 15 days | USD 42.90 | USD 2.86 |
| 30 days | USD 61.90 | USD 2.06 |
| 60 days | USD 106.90 | USD 1.78 |
Trips of 1 to 4 days pay the 5-day package. Maximum 90 days per eSIM. A second eSIM in the same order gets 10% extra off — useful if a travel partner's phone is unlocked and yours is not yet. Run your dates in the price simulator.
What to do if you are abroad with a locked phone
Being stuck at an airport with a phone that refuses every network is a bad way to start a trip. Options, from best to worst:
- Call your carrier over Wi-Fi and request an immediate unlock. Some do it remotely in hours.
- Use your home carrier's roaming as a stopgap. T-Mobile, AT&T, Verizon, EE, Vodafone and others sell daily or bundled international passes; rates vary by country and plan, so check the current rate in your carrier's app. It usually needs to be enabled before or at the moment of travel. More context in our roaming overview.
- Buy a local physical SIM. It works on a locked phone only if the lock is to that same network — which abroad it will not be. So this generally fails too.
- Borrow an unlocked phone and install the eSIM there.
If your phone is unlocked and the eSIM still shows no signal, run the free eSIM Rescue tool — it diagnoses an eSIM of any brand.
Locked phone vs unlocked phone: what changes
| Locked phone | Unlocked phone | |
|---|---|---|
| Travel eSIM | Usually rejected by the network | Connects automatically at the destination |
| Local SIM abroad | Generally will not register | Works, but needs a shop and often passport registration |
| Home carrier roaming | Works | Works |
| Keeps your number | Yes | Yes — eSIM is data only, your physical SIM stays active |
With VoaSim, your physical SIM and your number keep working, so WhatsApp stays on your usual number. Just turn off your home carrier's data roaming so it does not bill you in the background. Install the eSIM at home before you fly and keep the line off until you land — the days start counting at the first connection at the destination.
See how the whole thing works in our comparisons.
Why trust VoaSim?
Registered company with an invoice on every purchase, USD payment via Stripe with no hidden fees, human support and a guarantee: if the eSIM will not connect and support cannot fix it, you get 100% back.