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The LaTeX command for Phi (Φ) is \Phi. The lowercase form ϕ is \phi.
\PhiWrite \Phi inside math mode, that is between $…$ for inline math or in a \[ … \] or equation block for display math. It is part of core LaTeX math, so no extra package is required.
$\Phi(x) = \Phi_0$Prefer to see it live? Paste it into the LaTeX preview and it renders as you type: no compiler, no signup.
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Use \Phi in math mode; it needs no extra package. For example, $\Phi(x) = \Phi_0$.
None: \Phi is built into LaTeX, so no extra package is required.