SIM Cards
A SIM lock ties your phone to one carrier, restricting your ability to switch networks or use local SIMs when you travel. This guide explains how SIM locks work, how to check your device, and what steps you need to unlock your phone for maximum freedom at home and abroad.
When you buy a new phone through a carrier or installment plan, you might see the term “SIM lock.” SIM lock means your phone can only use that carrier’s SIM or eSIM, limiting your ability to switch providers or use your device while traveling. This guide explains what SIM lock means and how it affects switching carriers or using an eSIM while traveling.
A SIM lock is a setting that keeps your phone tied to one carrier’s SIM card. That means you can’t use SIM cards from other networks.
For example, if you bought your phone from AT&T, you wouldn’t be able to use a T-Mobile or international SIM unless the phone is unlocked.
This restriction is common on phones purchased through a contract or monthly payment plan, as it helps ensure the customer stays with the carrier for the duration of the agreement.
Carriers impose SIM locks primarily to:
While this policy benefits carriers, it can be frustrating for users who want to travel or switch providers before their contract ends.
Depending on your device, there are a few ways to check if it's SIM locked.
For iPhone:
Here’s what it looks like when an iPhone is SIM locked.
For Android:
Below is an example of an Android phone that shows available networks, which usually means it’s not SIM locked.
Another option:
Unlocking a phone is usually straightforward once you’ve met your contract or payment terms.
Tip: Avoid third-party unlock services unless necessary. These include online unlock code sellers, jailbreaking tools, or SIM adapter chips. They can void warranties, expose your phone to security risks, or permanently damage the device. Official carrier methods are the safest and most reliable.
These final tips will help you avoid SIM-related issues and stay online during your trip.
If your phone isn’t SIM locked and supports eSIM, you can skip the hassle of physical SIM cards.
eSIMs let you download a mobile plan digitally, making them ideal for travelers who want fast, flexible data options abroad.
Here’s a quick comparison of top eSIM providers:
| Provider | Best For | Pros | Limitations | |
| Holafly |  | Unlimited data in 200+ destinations | Easy setup, 24/7 support, Reliable data speeds | Pricier than other eSIM providers, Hotspot availability and limits vary depending on the country |
| Airalo |  | Budget-friendly plans | Wide country coverage, low cost | Unlimited data plan availability varies by destination, Some users report limited customer support |
| Nomad |  | Global coverage with pay-as-you-go options | Flexible pricing, Easy in-app setup and top-ups | Access to unlimited data varies across regions, Occasional signal issues have been reported by users |
These digital SIM options are ideal for short-term travel, multiple destinations, or as backups for primary mobile service.
For travelers who value unlimited data, easy setup, and responsive support, Holafly is the top pick. Its plans are designed for hassle-free use, with quick activation through a QR code and 24/7 customer service to resolve issues anytime.
No. If your phone is SIM-locked, you can only use eSIMs from the carrier it is locked to. To use an eSIM from another provider, especially when traveling, you need to unlock the device first.
Yes, most carriers allow you to remove a SIM lock once certain conditions are met, like completing a contract or paying off the phone. You’ll need to request an unlock through the carrier that locked the device.
Yes. According to Apple, only your carrier can unlock your iPhone, and you must meet their requirements before they initiate the unlock process.
SIM lock is a software restriction programmed into the phone by the manufacturer at the request of a carrier. It blocks the use of SIM cards from other networks until the device is unlocked.
A SIM lock ties your phone to a single network provider, preventing you from switching to other carriers. It ensures that the device is used only with the carrier that sold or subsidized it.
The best global eSIM provider
From $2.3/week
A reliable eSIM provider for budget travelers
From $2.4/week
The best global eSIM provider
From $2.3/week
A reliable eSIM provider for budget travelers
From $2.4/week
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