The most widely used simulation models for GSM modules in Proteus are provided by The Engineering Projects GSM Library for Proteus: This package usually includes the module, which is functionally almost identical to the Go to product viewer dialog for this item. for basic UART (AT command) simulations SIM800L Specific Models:
The SIM800L appears in the device picker but fails to respond during simulation. The error message may read "Component has no simulation model" or "Failed to load DLL". sim800l proteus library
3.4 SMS and Call Simulation
(Often libraries are designed for hardware interfacing, but some provide visual models). The most widely used simulation models for GSM
Serial.println("Alert SMS sent!");