This may be shocking news for you, but it's not necessary to use a mobile device to get around Thailand. I never did for decades, yet I was able to travel over much of LOS, find hotels ( by looking ), use buses and trains and taxis, etc.
I even did much of it before the internet existed for us.
Have you considered that being dependent on a device is not really a good idea. Had it failed while you were traveling would you then have been unable to continue?