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 August 13, 2018 16:44 Follow Have more questions? Submit a request 0 Comments Please sign in to leave a comment.