The transaction is stuck although I believe with ~600 satoshi/byte I added enough fee to at least have it confirmed in a couple of hours (it has been 21 hours now).
This is of course dependent on the first transaction because the wallet does not contain enough BTC if the first transaction is not confirmed.
Can the fact that I spend unconfirmed BTC be the cause of the delay of the first transaction? I can add fee to the second transaction in my Android wallet, but not to the first.
Thank you for your help, I might later on ask for help confirming transaction 1. If you want I can tip you, what would you think is appropriate? If I decide to do so, I will fill out a post properly for you.