There are two separate gates, at two different levels.
The phone icon is missing from your nav entirely
It only appears if both are true: your organization has phone turned on, and you hold the Access VOIP right. If either is missing, ask your administrator.
The phone icon is there, but the dial pad won't let you dial
Even with phone turned on for your organization, your own member account still needs to be connected to the phone system before you can place or receive calls. When it isn't, the Dial tab shows a message in place of the dial pad — in the current build this literally reads "Connect your RingCentral account to start making calls" even for organizations on a different provider, so don't be thrown off if your org isn't actually on RingCentral; it links to your Settings → My Account → Phone tab, where you (or your administrator, depending on how your org is set up) finish the connection.
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