81709
In Germany , most contemporary telephones have a specific button functioning as call return , which is an internal function of the telephone itself ( the number of the last caller is stored inside the phone at the time of that last call ) and thus does n't have a numeric code .
 Germany
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Germany