Is this even possible that people are just buying a phone to make use of them as their crypto wallets? I doubt and instead of that why not buy a laptop for that purpose or get yourself a hardware wallet at once. The people I know making use of android wallets (apps) are doing so with their main phone (that's the phone they use for their everyday use). I have heard about cases of their Bitcoin or other coins disappearing from their phone but haven't experienced one or seen one physically but it's happening because alot of stories online can't all be a lie. For people hunting airdrops, they're usually the victims of this hack so although android wallet can serve for short term holding for active transaction, they aren't the best and shouldn't be use for large sum transactions or for hodling. Better to take the precaution than regretting not taking the advice.