16905
In addition , almost all UMTS phones are UMTS / GSM dual-mode devices , so if a UMTS phone travels outside of UMTS coverage during a call the call may be transparently handed off to available GSM coverage .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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