Is it okay to use my phone or a book as a guide during prayer?

Assalamu alaikum brothers and sisters, Lately, I've been re-learning Islam on my own after realizing there were quite a few things I'd misunderstood or been taught incorrectly. One thing that really struck me and made me feel so disappointed is that I've been reciting the Tashahhud wrong all this time. It's not completely off, but as we know, any mistake in prayer is a serious matter. My issue mainly comes from not knowing Arabic, so I've missed out on some words. So, here's my question: Would it be acceptable for me to keep the correct pronunciation and words in front of me, maybe on my phone or in a book, to make sure I get it right? I really want to perfect my salah. JazakAllahu khayran for any advice!