24/7 customer service in 5 languages: The OxygenWorldwide service is available 24 hours a day via the telephone numbers (+ 34) 96.688.28.73 (GMT time) and for emergency calls out of office hours at: (+ 34) 609.657.727 in 5 languages. English, Spanish, French, German and Dutch. OxygenWorldwide likes to emphasise this point to our clients as this is a very unique customer service when it comes to medical oxygen supply worlwide.