This is a paid asset, but now you can download Phone Call System for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Phone Call System v1.2
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The Phone Call System is a complete template for implementing unlimited styles of Phone Interaction. The has 3 included variants: Payphone, Office and Mobile – These allow you to input a varied string code to the length of your choice, which if matched by the player will allow you to play an audio clip – In this case, a phone recording or call.
NEW FEATURES:
►*NEW* – V1.2 – Completely rewritten, Unified Managers and Optimisations
►V1.1 – Big Rework, Managers, Elements & More!
CORE FEATURES
►Supports: First Person & Third Person Interaction
►Raycast and Trigger Event Interaction
►3 Custom UI phone keypads:
►3 Custom PBR Phones:
►Wall Pay Phone
►Office Phone
►Modern Mobile Phone
►1-Infinity Keypad Input
►Call infinite amount of numbers
►Sprites / Textures Included
►Basic sound effects
►Fully prefabed
►Full Documentation
►Full C# Source Code