Schematic for the Apple iPhone 3G, supplied as a compact PDF of about 612 KB. The small size suggests it may be a partial set, so check which pages and sections are included before relying on it. Phone schematics are used to trace rails, locate the connectors and filters on a damaged line, and understand how the charging, display and radio circuits are wired. Open it in any PDF viewer and confirm the board variant matches the logic board you are repairing, since parts and numbering can differ.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @schematicmobile. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.