I created a 15 word wallet using the Yoroi app on an iPhone in December '21 and transferred a small amount of ADA to it (the balance showed up correctly in the Yoroi app). I recently switched to a new iPhone and tried to recover the wallet using the 15 word seed phrase (which is definitely correct). The restored wallet shows a balance of 0 ADA, while I can still see the transaction and the correct balance on cardanoscan.io. It seems like there was derived a new/different wallet from the seed phrase…
I read about similar issues on the internet (e.g. here: ADA missing after restoring wallet in Yoroi - #22 by Scarlett - Community Technical Support - Cardano Forum) - is there anything I can do to get access to my original wallet?!