As an additional option, if you use the Android/Google Messages app, you can link another device/laptop and any communications are bounced through Google's cloud, but End-to-End encrypted. I use this all the time from my tablet I take into the Data Center, and frequently leave my phone upstairs. Keeps support for RCS as well.

Additionally, you can also use Google Fi, which supports the same messages app, and syncing the messages and responses like Apple's iMessage, just by logging into your Google Account after a little setup. I believe it's also intercepted upstream, and isn't reliant on another device being powered on.

Disc: Googler, not on Messages.