How to activate your Samsung Galaxy S25

Press the Side key.

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If your SIM is locked, key in your SIM PIN and press OK. The default SIM PIN is 0000.

If an incorrect SIM PIN is entered three times in a row, your SIM will be blocked. To unblock your SIM, you'll need to key in your PUK. Sign in to the O2 website to get the PUK. Please note: If you key in the wrong PUK ten times in a row, your SIM will be blocked permanently. In this case, you need a new SIM from O2.

Press Start.

Press the required language.

Press Next.

Press the fields next to the required settings to select them.

Press Next.

Press the required setting to transfer content from another device or press Set up manually.

Press the required WiFi network.

Key in the password for the WiFi network and press Connect.

If there are no available WiFi networks, you can use the mobile network instead.

Press Next.

Press Don't copy and follow the instructions on the screen to finish the activation.

You can also transfer content from another phone or restore the content of a Google One backup.