It has been reinvented from those old school flip phones.
It reinvents from those old school flip phones?
If your saying that foldable phones reinvent from flip phones.
I believe you mean this: It has been reinvented from those old-school flip phones. The hyphen is important. It shows that you mean flip phones that are 'old school', not old flip phones that were used in schools.
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I believe you mean this:
It has been reinvented from those old-school flip phones.
The hyphen is important. It shows that you mean flip phones that are 'old school', not old flip phones that were used in schools.