Obviously, you don't know what phase is or how it works and I deduce this simply by virtue of your original question. A microphone can't have a phase problem simply by virtue of its pickup pattern.lol it was 1 question that no one is truely explaining just guessing at. so dont guess at it. i know how phase differences work. quit trying to teach me about everything i already obviously know, im not a newb over here going DURRR HowW DoEs i RecErd tEh MuSIC. the question was, do you think omnis have phase issues or not, not "can u explain to me what phase is and how it works".
If you are referring to comb filtering or exaggerated separation effect in a stereo mic'ing situation this is one thing. If you are referring to phase cancellation in mono, this is another thing (though the two can be related), if you are referring to acoustic phase cancellation at the diaphragm of the mic because of reflections from nearby surfaces, this is yet another thing.
What exactly are you asking?