This example shows a mobile network graph with green circular nodes representing phone models and red links connecting them to their respective brands. The visualization uses a force-directed layout powered by `d3.forceSimulation`, with `d3.forceLink`, `d3.forceManyBody`, and `d3.forceCenter` to position the nodes. Nodes are rendered as SVG circles via D3 selections, and the drag interaction is implemented with `d3.drag`. The graph is built with D3 v7 and displays data embedded in the script, with node coordinates updated on each simulation tick.