Ever tested your partners faithfulness?

Exclusive relationships that does not admit other things or one that cannot exist or be true if something else exists or is true? Anyway, my only experience with this kind of 'fidelity test' was when a classmate of mine had a very terrible quarrel with her boyfriend who happens to be an upper class man. Though not knowing of how the disagreement began or whatever the cause was, we helped her out on determining if their relationship was just on the rocks or going down to the trenches. She asked for a cellphone and did just what you have exemplified. She introduced herself with the borrowed cellphone to her unsuspecting boyfriend through SMS as just one of those mobile phone users who luckily sent a message in a randomly dialed manner. It was disappointing for her to realize that her boy friend just conveniently became available again just after their unsettled spat. We really couldn't confront the guy about it since, we were obviously in no position to beat him up for unsettling our friend. Later on, that classmate of ours just decided to focus on her studies more than to be in any relationship anytime soon.. though, it has been a while since that happened.. perhaps she already has someone reliable..