+Mention-ing someone in a Google+ post or comment is a neat way of grabbing someone's attention; whether to ask them a question, to give them credit or just simply to thank them. When we +Mention someone, a link will be created between our post or comment and the person mentioned. A notification will also be sent to the person mentioned.
Call me weird but I have always liked accessing Google+ (Facebook too in fact) via its mobile site on my Windows desktop PC. Google+ pages on the mobile site just loads faster compared to its desktop version because of its minimal bandwidth requirement. But there was one problem - I had never found a way to +Mention someone from Google+ Mobile. This has subsequently led me to wrongly assume that it was not possible to +Mention someone from Google+ Mobile. But after something like 2 years, I have finally found a way. I accidentally stumbled upon this workaround about a week ago when I clicked on the About page of MacroAddict on Google+.
I have tested it out by Google+ mentioning myself in a test post and found that it actually works. I have tested it on Google+ Mobile running under both Opera desktop (just remember to use the URL for Google+ Mobile: https://plus.google.com/app/basic/stream) and Opera Mini. I guess I must have not looked hard enough previously.
The Steps To +Mention Someone
To Google+ mention someone in a post or comment, just type '+' followed by the person's Google+ numeric ID (A Google+ profile custom URL will not work; it must be a Google+ numeric ID).