I lost my smartphone this morning and I think the battery might be dead. I had the internet and GPS turned on, but now the device is unavailable.
Are there any services that show the phone's last location or help me find it after it's turned on?

If you had GPS and internet access enabled, that's a big plus. In most cases, this helps you at least figure out where your phone was last seen.

Even when your phone is unavailable, there are services that save its last known location and can notify you as soon as the device comes back online. One such service is GEOfinder find my lost phone. This service allows you to track your phone and see its last activity and also helps you receive a notification when the device reconnects. Many people have already reported that it has helped them quickly find their lost smartphones.