If this happens, is important that you continue making every effort to keep in touch with your children by any means available, including telephone calls, text messaging, and Internet applications such as Skype. Failure to do so could be interpreted as a lack of interest. This could work against you if, for example, you seek a modification of custody arrangements at some time in the future.
Remember that the family court will probably expect your ex-spouse to cooperate with your efforts by, for example, setting aside a time for your children to connect with you on Skype. Remember that, as long as your Permanent Parenting Plan is flexible enough, the missed time can be made up.