The Mexican woman giving Mike the phone charger is symbolic to his situation with Gus.
Making things harder when they really don't have to be...when you have someone right there to help you.
As another poster stated, this is when Mike starts letting go of his burdens and goes all in for Gus.
I wouldn't be surprised if Gus went through a similar phase after Max was killed, which is why he may be able to relate to Mike's grief.
Man, they really added some layers to Mike and Gus' partnership. It wasn't as neatly packaged and simple as I thought it would be. At one point, I figured it was all gravy between them, but what's going on now is going to solidify Mike's loyalty