# Page Not Found

The URL `201_intorduction/203_applications/211_phone_book_2.0` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [Phone Book 2.0](https://dimitar-minchev.gitbook.io/developing-cross-platform-apps/201_intorduction/203_applications/207_phone_book_2.0.md)
- [Phone Book 1.0](https://dimitar-minchev.gitbook.io/developing-cross-platform-apps/101_intorduction/109_applications/113_phone_book_1.0.md)
- [JSON Reader 2.0](https://dimitar-minchev.gitbook.io/developing-cross-platform-apps/201_intorduction/203_applications/211_json_reader_2.0.md)
- [Primes 2.0](https://dimitar-minchev.gitbook.io/developing-cross-platform-apps/201_intorduction/203_applications/206_primes_2.0.md)
- [Fibonacci 2.0](https://dimitar-minchev.gitbook.io/developing-cross-platform-apps/201_intorduction/203_applications/205_fibonacci_2.0.md)

## How to find the correct page

If the exact page cannot be found, you can still retrieve the information using the documentation query interface.

### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter:

```
GET https://dimitar-minchev.gitbook.io/developing-cross-platform-apps/201_intorduction/203_applications/207_phone_book_2.0.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

### Option 2 — Browse the documentation index

Full index: https://dimitar-minchev.gitbook.io/developing-cross-platform-apps/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://dimitar-minchev.gitbook.io/developing-cross-platform-apps/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

## Tips for requesting documentation

Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/developing-cross-platform-apps/201_intorduction/203_applications/207_phone_book_2.0.md`).

You may also use `Accept: text/markdown` header for content negotiation.