How to remove and insert the SIM card
If you've just picked up a new smartphone, lost your previous device, or switched mobile providers, you'll eventually need to change your SIM card. This is especially important if you're using an iPhone or replacing a prepaid SIM. The good news? Swapping your SIM card is a quick and easy process – as long as you know the right steps to follow. Here’s how to change your SIM card safely, quickly, and without losing any of your data.
23.05.2025 | Reading time: 5 minutes
How to change the SIM card on iPhone
You just need a small SIM ejector tool (usually provided with the device) or, if necessary, a paperclip.
The SIM tray is located on the side of the device. Gently press to open it, remove the old SIM card, and carefully insert the new one, making sure the gold contact side faces down and that the card is properly seated. Then, push the tray back in, turn on your iPhone, and enter your PIN.
Good to know:
If you’re using an eSIM – which is common on many newer iPhones – the process is even faster. In Settings > Mobile Data, you can scan your provider’s QR code directly. The eSIM will be installed automatically without having to physically remove or insert anything.
If you're switching the SIM card on an iPhone, using an eSIM is a particularly convenient solution – no tools, no waiting.
How to change the SIM card on Android
On Android devices, the process is similar, although menu layouts may vary slightly depending on the brand and your smartphone model. The SIM tray is usually located on the side or top of the device. Open it using the SIM tool, remove the old SIM, insert the new one, and you’re done.
Some older models may require you to remove the battery to access the SIM slot.
Today, many Android smartphones also support eSIMs. You’ll generally find the option under Settings > Network & Internet > Mobile Network, where you can add a new eSIM easily by scanning a QR code.
If you’re changing a prepaid SIM card, make sure your balance and phone number are transferred – with most modern smartphones and using eSIMs, this is done automatically.
What to consider when changing a prepaid SIM card
If you’re switching a prepaid SIM card, two aspects are crucial:
- Credit transfer: With most providers, this happens automatically. If unsure, double-check with customer support.
- Identity verification: In Switzerland, activating a new prepaid SIM requires an identity check, which can usually be done conveniently through the app or online.
Also important: make sure your existing number is transferred, especially if you are switching providers.
Blocking and replacing a SIM card
If your phone is lost or stolen, you must block your SIM card immediately to prevent unauthorized access to your data or mobile credit.
How to block your SIM card
Most Swiss mobile providers offer simple ways to block your SIM:
- Directly via the yallo support team.
- Through your online customer account or by calling customer service.
At yallo, for example, you can block your SIM easily and quickly online.
Ordering a replacement SIM card
If your SIM card is blocked or defective, you can order a replacement:
- As a physical SIM card sent by mail.
- Or as an eSIM, available instantly via QR code.
Delivery of a physical SIM card usually takes 2–3 business days. An eSIM is available immediately – perfect if you need to quickly replace a SIM card on your iPhone.
Tip: If you’re changing a prepaid SIM card, check in advance whether your balance will be transferred automatically.
How to activate your new SIM card
After receiving your new SIM – whether physical or digital – you will need to activate it. The process depends on your device type and the kind of SIM you have.
Activating a physical SIM card
Here’s how to do it:
- Turn off your phone.
- Open the SIM tray with the tool or a paperclip.
- Insert the new SIM card (make sure it’s positioned correctly).
- Close the tray and turn your device back on.
- Enter your PIN and check for network connection.
If your phone doesn’t automatically connect to the network, you can manually configure the network settings – the necessary instructions are usually available on your provider’s website.
Activating an eSIM
Especially convenient if you have a recent iPhone:
- Go to Settings > Mobile Data > Add Mobile Plan.
- Scan the QR code provided by your carrier.
- Confirm the setup.
The process is similar on Android, though menu names may vary slightly. Important: your device must be compatible with eSIM technology.
Step-by-step guide: how to properly switch your SIM card
Changing your SIM only takes a few minutes if you're well prepared.
Before you start:
- Back up your data (contacts, photos, files).
- Have your new SIM PIN ready.
- Keep the SIM eject tool or a paperclip nearby.
The procedure:
- Turn off your phone.
- Open the SIM tray and remove the old card.
- Insert the new SIM card.
- Turn the device back on.
- Enter the PIN.
- Check for network connection.
If everything goes well, you’ll be reconnected within minutes. If not, restarting the phone or manually selecting the network provider may help.
What to do in case of problems
If your phone doesn’t connect after changing the SIM:
- Restart your device.
- Check that the SIM card is properly inserted.
- Select the network provider manually in the settings.
- Manually configure the APN settings if needed.
For iPhones, it may also be necessary to install a carrier settings update: go to Settings > General > About and confirm the update if prompted.
