The CHALLENGE...
-To travel overseas whilst avoiding horrendous SMS roaming charges.
-The solution would, preferably, not be subscription-based in order to prevent ongoing expenses.
The BACKGROUND...
-The only way into some two-factor authentication (2FA) secured accounts is via SMS, including my bank that uses this method (they do, however, offer a token generator device for a small monthly fee).
-Even if I disabled roaming until I needed it for a 2FA-secured login (optionally just so that I could login to then transfered the 2FA to my current overseas' number), the minute I temporarily enabled roaming, any other queued up SMS messages (unrelated to 2FA) would be streaming in and cost me a small fortune!
-I cannot guarantee that I could disable 2FA on all 2FA accounts utilising SMS-only authentication before I travel, nor would I want to. The reason I cannot guarantee this is that I don't know with 100% certainty all of my accounts that are secured using SMS-based 2FA. As such I am forced to discover such accounts on a per access basis whilst travelling.
-I also cannot guarantee that I have recovery codes for every 2FA-secured account, i.e., I cannot rely on recovery codes to gain access, nor would I want to.
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, the question is: which such solution would be the most reliable and most real-time one? After all long delays are unacceptable as it would deny 2FA access which is time-based.
The SOLUTION...
-???