SIM & connections

Make sense of cellular service, Wi-Fi, power and the route an alert takes to reach you.

Travel routers and captive portals need extra care

A network that asks a person to sign in through a web page may not suit a device left to reconnect by itself.

A familiar description can conceal a radio or service dependency that no longer suits the intended installation.

A live picture passes through several systems, so judge it as a remote view rather than an immediate view through a window.

A short record can help someone distinguish a power problem, an expired plan and a disconnected cable without guessing.