A web application that enables users to participate in auctions or sell SIM cards.

1. Admin: Manages user and provider accounts, oversees auction transactions.

2. Provider: This role is for users who register to sell their SIM numbers. Providers must wait for admin approval and verification of their reputation before their accounts become active. Once approved, providers can manage their auction listings and communicate with auction participants.

3. User: These accounts are registered to participate in auctions as customers of the providers. Users must complete their account information to make a deposit and participate in auctions. They can also filter and search for specific types of SIMs, manage their auctioned SIMs, and handle payments for successful bids.

4. Chat Function: Available across roles, this feature allows users to exchange information and communicate with each other.