It is highly risky to use a public computer at a library, Internet cafe, or hotel business center to conduct personal business, or even read your email. Do some research — perhaps using the resources below — before you start.
It may seem that using a mobile (cellphone) network avoids the threats that public hotspots and hotel ethernet connections present. Yes, you avoid some of them, but other's remain. The links below lead to more information on these new threats.