 How to call:
001 - Exit code when making an international call from Guyana
44 - UK country code for inbound calls
1638 - Newmarket city code
001 + 44 + 1638 + Local Number - International dialing code format
 World Times:
The time in Guyana is now 17:01:54 PM (05:01:54 PM)
The time in Newmarket United Kingdom is now 22:01:54 PM (10:01:54 PM)
 Mobile codes:
To call a mobile phone in United Kingdom from Guyana use the following dialing code format: 001 + 44 + Mobile Code* + The Number
*United Kingdom has multiple mobile carriers: 74## (Mostly mobile broadband), 75##, 7624 (Isle of Man), 77##, 78##, 79##
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