Avoid user visiting on webpage, based on OS, OS Version, Geo, Operator and Screen size

I'm looking for a skilled programmer to create a script that can block users depending on their geolocation and operator, and display different content accordingly. The primary goal is to deliver a more personalized user experience, not to block content based on legal requirements or to prevent fraud.

Key Requirements:
- The script needs to block users based on their geolocation and operator.
- The script should enable the display of different content for users based on their geolocation and operator.
- Specifically, I aim to show localized advertisements to users based on their geolocation and operator.

Ideal skills for this project include:
- Proficient in JavaScript and/or PHP
- Experience with geolocation services and operator detection
- Understanding of user experience customization

Please provide examples of similar scripts or projects you have worked on that demonstrate your capability in this area.