I have more than three smart phones. This smart phone service has been opened. However the other smart phones services have not been opened. They are juse second-hand smart phones. With the phones, I can take photos and make videos a lot.

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Could you check the short pases and correct the grammatical errors, please? Thank you.

I have more than three smart phones. Service for one of my smart phones is through one carrier, AT&T. However, the other two smart phones don't have carriers. They are just second-hand smart phones with which I can take lots of photos and videos.

I have more than three smartphones. The service on one of these smartphones has been activated, but the services on the other smartphones, which are second-hand, have not been activated. With these phones, I can take numerous photos and videos.

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Here is the corrected version of the text. I have only made minor changes to improve clarity and grammar.