i don't know if i would call every day. There is then a dependency on that and an expectation that if it is not fullfilled or if the calling frequecy becomes less then there is something wrong.
i generally am not bound by a daily routin. But i do not particularly like phones to begin with.
i want to add that a certain level of longing is sweet, sexy, and makes one excited to see her lover. But a level of missing where one feels unable to do much or enjoy life because she is away from her lover is a sign that there is something not working well in the relationship.
Said the mistress of relationships!