You need to get an app that allows you access to files or use the one built in your phone, but I suggest Zarchiver, download the game onto your new phone and and save alteast once so you can gain the ability to see the saves on whatever your using to access your files, then on your old phone, you need an SD card for this, copy the save onto your SD card then tranfer the sd card to your new phone and then transfer the file to the save files on your new phoneand replacethe file with the save of the same name of the file you want to transfer, im sorry if the way i explained how is confusing, this is the best way i can explain how without making this comment too long, and as for your old phone, to not end up losong your file just in case you mess up on something, copy and paste the save onto your SD, is you move it to the, any mistakes can lead to you losing your progress, other wise there is nothing else you have to do except finding the save files to copy it, there is no need to tamper with any of the file just click and open folders to find the save and as for your new phone just like the old phone they should be in the same named folder where the saves were and when you find it on your new phone, just paste and replace, and make sure it has the same name or else the game wont recognise the file as a save and because you have no progress on the new phone, you can make mistakes so dont be afraid, but like before there isnt much taampering needed othere that replacing files, I'm hoping this was helpful, and I hope your able to do what you asked have a happy day ☺️