Since you have an order, keep good records and file for contempt when a pattern of non-compliance is evident. Remember that as kids get older, they would rather talk to friends than parents and would rather text. If they have their own phones (even stupid ones), you may find a text conversation (which I personally hate but my children use almost exclusively with their friends) to be a more satisfying substitute for a voice call. Remember too that with texts they can send pictures of their activities when they want and you can send pictures of, for example, their pets.We have it written out in the final judgement that I will call during the summer on Monday, Wednesday and Friday at a specific time. If he needs to change the time, he can send a message through OFW to change it.
During other times (not summer), I will call once during a 3 day period...usually, the day before they return home so that I can remind them to do homework, pack things for school, etc.
Their father goes through phases where he will answer and allow communication and phases when he will ignore calls or say he didn't hear the phone or had no signal, so OFW helps me to document all that. If he doesn't answer, or I can't reach the kids, I send a message on OFW saying, "Dear xxxx, I tried to call the kids today at xxxx. Please have them call me when it is convenient."
This usually also prompts him to be sure to have them return my call because he knows it is admissible in court. If I was harassing him or calling too much, it would also be evident to a third party in OFW.
OFW is a great tool that really works for both parties...if they use it.
Take Care.
I assume dad has the same phone privileges. If not, why not?
Adapt your contact choices for changes in technology and the children's ages. You do not want to have telephone calls become a source of stress and conflict. You want them to call you when they are 20 and 30 and 40 because they want to and not because it is court ordered.