Got another question:
I've never really used any wallet besides the qt one, could you please explain or link me to an explanation of what kind of trust you need to put into 3rd party wallets?
There will be no blockchain on a mobile phone so what exactly is it that one trusts the wallet dev with? Privacy, security? (besides the obvious wallet.dat steal that's always possible)
Both Hive OS X and Hive Android are SPV clients (Simplified Payment Verification). That means, that they indeed do not download the full blockchain, but still download small parts of it, in an effort to verify as much as possible on there own, given the limited set of resources available on a mobile device. Some more technical background can be found here:
https://en.bitcoin.it/wiki/Thin_Client_Security#Simplified_Payment_Verification_.28SPV.29 and
https://bitcoinj.github.io/security-model . Overall, you aren't that much worse off compared to a full node. An SPV client needs to ask for fairly specific details from the Bitcoin nodes around it, so there is some reduction of privacy in that respect.