Some people only have one computer and that must suck. Fortunately I have multiple so I can use some of my alt-miners to do this safely.
Yes also me i have one phone, how can i do this safety?
Smartphones do not have good security. If you must use them for for holding Bitcoin I would back up your entire wallet to an external drive. Then i would do a factory reset. Restore you wallet. Do not download any 3rd party software. Do not connect to public wifi.