The heating of phenyl-methyl ethers with $\text{HI}$ produces:

Phenyl-methyl ether (Anisole) reacts with $\text{HI}$. The $O-C{H}_3$ bond is weaker than the $O-Phenyl$ bond (which has partial double bond character due to resonance). Therefore, the $I^{-}$ nucleophile attacks the methyl group.${\text{C}}_6{\text{H}}_5-\text{O}-{\text{CH}}_3+\text{HI}\to {\text{C}}_6{\text{H}}_5\text{OH}+{\text{CH}}_3\text{I}$ The products are Phenol and Methyl iodide.