I am new to bitcoin and I am confused about wallet, private key, seed etc.. my aim is to buy bitcoin and HODL for life.

I currently only have 2 wallets on my phone (blockchain app and electrum) and I have written down the 12 seed phrases for them. If I were to format or buy new phone now and reinstall those 2 wallets, is it true that I still can access my wallet with my email and 12 seed phrases and able to see my bitcoin address and btc right? I do not have wallet for pc desktop.