iPhone 11 or newer (Brooklyn)

Hello to everyone,
I received a free forever line in Optimum because they are offering it to people who have two or more lines.
When I try to add my daughter's iPhone 6s with the line, it's incompatible with the company.
So if anyone has an iPhone 11 or newer that they could pass on, I would so appreciated and be grateful.
My daughter needs to communicate with me and I'm hoping to put the bill of her current cell phone service behind.
Thank you for reading my request.

Sharon V.
Can you help with this request?
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