Techniques for reducing latency between resources of a cloud provider network and end user devices are described. In one embodiment, a system includes a cloud provider network including a first control plane service to manage customer compute instances hosted on resources of the cloud provider network. The system further includes a first provider substrate extension of the cloud provider network connected to a first communications service provider network. The first provider substrate extension includes a first computer system having capacity for executing customer compute instances, is controlled at least in part by the first control plane service via a connection through at least a portion of the first communications service provider network, executes at least a first customer compute instance using the first computer system, wherein the first customer compute instance communicates with a first mobile computer system connected via the first communications service provider network.