@Mike *******
pardon me but that is not wise to count on using your phone as proof of your OA Evisa.
And the airline staff also may ask to see proof of your having a retirement Visa.
Especially as you are planning on using the Re-entry benefit of the OA visa as you visit other SE Asian countries.
SIMPLY PRINT OUT 2 COPIES.
Keep them in safe place with your documents.
That's peace of mind ๐ค