I dont know if this is a bug or limitation. I want a \+44.@ using a Mob Route Filter to match a dialled number of +447917123456, so have a route filter with a tag of Mobile Access and Mobile Subscriber exists (so no National Access i.e. the leading 0).
US Cellular - Baraboo 906 Us Highway 12, Ste 102, Baraboo WI 53913 Phone Number: (608) 356-9380
Motorola Headquarters 222 W. Merchandise Mart Plaza Ste. 1800 Chicago, IL 60654. Phone Number: Customers can call  1-800-668-6765 to reach the customer service department. This phone number was listed with the corporate mailing address. There is no direct line for corporate listed on the official website.