The telephone number 00 263 7 87828937 is being used as part of an international premium rate number scam. The tactic they employ is called Wangiri, loosely translated from the Japanese as one cut.
This refers to the way the scammers do a one-ring call to your phone then cut the call. This is in the hope that the victim will phone them back. Any calls to the number 00263787828937 will be redirected to an international premium rate number for which victims are charged an extortionate rate.