I saw in Oxford dictionary this telephone number: 25844 two five eight double four. Do we say double four? Do American people say double or not?
IMO, the most common method is to pronounce each number with a pause after the first 3: 9-8-7...6-5-4-4
The second most common is the pronounce the last four as two two-digit numbers. 9-8-7...sixty-five forty-four.
Some may say double 4, but it isn't common.
Pope of the Dictionary.com Forum