Iphone won't activate even though it's not blacklisted nor is it sim locked? I've checked the IMEI and it's clean?

I have an Iphone that won't activate, the IMEI isn't blacklisted, there's no activation lock on it, there's no icloud lock on it, so I don't understand why it won't activate.

I've tried different sim cards from different carriers and they work in the phone, it shows the signal bars and 4G at the top, so I don't think it's caused by sim lock.

I've tried activating the phone using both Wi-Fi and carrier data but it's not working. Every time it takes me through the activation process it just says 'unable to activate'.

Is there anything else I could do?

Added (1). It starts from the 'Hola' page, it says connect to Wi-Fi, once connected I click next to go onto the next page, then it says 'it may take a few minutes to activate your iphone' then after that an error message comes up saying 'Unable to activate'

Tell us the exact sequence you went through telling us what is displayed at each step?

Try taking it to a phone store
and having someone there attempt to activate it.

Try to connect it to online something like cloud or itunes or what ever and try to have a reset or master reset done… Also it sounds like your son card my be loose.

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