What if I tell my brother's gf to take it easy with the continuous calling? It's annoying me.
She's calling your brother often?
Yes.
Maybe tell your brother instead, since he's the one that's around you with the phone. Or be honest with both of them and tell them it's obnoxious.
I'm not fucking mentioning anything to my brother.
If you insist, but I think you'd have a better chance to get what you want by dealing with him. He might enjoy the attention, but would be more likely to be concerned about your feelings.