How to Use AI Tool Calling on Your Phone Without Paying for a Single API

Tool calling is what separates a chatbot from an assistant. A chatbot gives you text. An assistant takes action - searches the web, runs a calculation, looks up a date, checks your files. When an AI model can decide on its own which tools to use and chain them together, it stops being a toy and starts being useful. The problem is that tool calling has always been a cloud feature. OpenAI function calling, Anthropic tool use, Google Gemini tools - all of them require an API key, a cloud connection, and a per-token bill. Even if you run a local model, most local AI apps do not support tool calling at all. Off Grid supports tool calling on your phone, with both on-device and remote models. No API keys. No cloud. No cost per call. What tool calling actually does When a model supports function calling, it can do more than generate text. It can recognize when it needs external information, call the right tool to get it, read the result, and incorporate it into its response. Automatically. Off