Why didn’t he just call her?

I’m aware that Wicker Park is a remake to a French film in the 1990’s so are we to assume that Wicker Park is also set in the 90’s which would excuse the lack of communication by mobile phones?

If not and this movie takes place in the present day why didn’t Josh Hartnett or Diane Kruger simply just call one another. They had each others cell numbers if I remember correctly. I feel like they didn’t try hard another if they really loved each other.

How is it that it took them two years to rekindle? Did the writers think that the audience are idiots with this obvious communication blunder.