What are the opening hours for Smarter Support? Smarter Support phone line is open Monday to Friday 10 AM - 7:00 PM GMT. Support phone number for UK and EU customers is 0800 802 1237. Support phone number for US customers is +1 (855) - 5522 Natalie December 14, 2018 14:39 Follow Have more questions? Submit a request 0 Comments Please sign in to leave a comment.