On Android, the save files are located at: InternalStorage\Android\Data\0011\Org.HHGv012.0011
If you don't have access to your old phone, you won't be able to transfer your save file though, since there is no Cloud save feature as far as I'm aware.
If you do have it then do the following:
1. Either copy the one you need (if it's in save spot 2, the name will be 1-2-LT1. save) and paste it in your new phone's file directory (if you're using the copy-paste method, you'll need a medium, like a PC to transfer the files, or you can send it to uourself via e-mail or upload it to some cloud solution idk).
2. Or you can just send the files via Bluetooth if I'm not mistaken. Find which diretory it was saved to and just move it to the correct one.