NOTE: Although this is a stripped-down and tweaked version of my previous post, it does differ in actual requirements; hence the new thread.
The CHALLENGE...
-To travel overseas allowing for bi-directional SMS whilst avoiding horrendous roaming charges.
-The solution would, preferably, not be subscription-based in order to prevent ongoing expenses.
The PROPOSAL...
-Purchase a cheap phone.
-Put my New Zealand SIM in it.
-Install a remote control app on phone.
-Permanently leave phone on and connected to a charger and WiFi at my parent's place.
The UNKNOWNS...
-If using a full-blown remote control app (which also would allow for additional benefits, such as remote administration, etc. of the phone), the question is: which would be the solution to use considering that TeamViewer QuickSupport requires manual confirmation to accept connections, which is not an option.
-If using an SMS remote control app only, i.e., one that allows sending/receiving SMS messages via another paired device (some even allow communication over e-mail), the question is: which such solution would be the most reliable.
The SOLUTION...
-???