code: func (c *IncomingNumberService) GetPageIterator(data url.Values) *IncomingPhoneNumberPageIterator {
  	iter := NewPageIterator(c.client, data, numbersPathPart)
  	return &IncomingPhoneNumberPageIterator{
  		p: iter,
  	}
  }
docs: // GetPageIterator returns an iterator which can be used to retrieve pages.