usually i have a Personal Computer that I use currently so it won't be of that bad to me, but most at times i often use my smartphone reply some comments over here.
From what you said so far, I will logout my mail from Smartphone to safeguard my fund since my phone can get stolen anytime.
It is a good prevention but always remember that you should never store all eggs in one bag. Eggs in this context is your coins, tokens. Don't store all of them in one wallet and on one device.
Especially if you use that device to connect to Internet and do many things which might expose your computer to virus, malwares, trojans and so on.
A biggest part of your capital should be stored offline, in an airgap device, cold wallet or hardrware wallet.