Need help to unlock my iPhone 4s

I had my iPhone 4S with Orange at first and later switched carriers. I’m thinking about unlocking it so my granddaughter can use it with O2. Unfortunately, I don’t have the original SIM anymore. Is it still possible to unlock the phone?

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​Yes, you can unlock your iPhone 4S for use with O2, even without the original Orange SIM card. While contacting the original carrier is one option, it may not be feasible without the original SIM. Passixer iPhone Unlocker offers a user-friendly solution to bypass various locks, including iCloud Activation Lock, without needing the original SIM card. while I have used this software for my 12 pro but this software is compatible with many iOS devices.

Thanks!