The number of exhibits is not great, but everything is displayed in a very compact and concise way - perfect if you don't have much time available.
There are useful information panels on different time periods. Next to each one you can click the "listen" button, to hear the audio, which is great for those who might have difficulty with reading.
I particularly liked the recording of Alexander Graham Bell, taken from the original wax disks.
History and technology buffs will love it here! To reach the Telephone Museum, follow this SLurl.