No disrespect, but the phone idea is preposterous. (I only had to do that once, to photograph an error message at a time when a computer was attacked by a virus that prevented the user from launching any software.) There are many types of software that allow you to make screenshots easily.
Yeah, LoadNGo Snip looks like one such software. The difference is, I've never heard of it and can't vouch for it (sometimes virus software masks as freeware), while IrfanView is world-famous, reputable software with many years of tradition & development, downloaded 46 million 413 thousand times from download.com alone.