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ITU-T recommends standard E.164, stating that 15 digits is the maximum. Summary: http://en.wikipedia.org/wiki/Telephone_number http://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-E.164-200502-I!!PDF-E&type=items

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15y ago
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13y ago

New world record for longest phone conversation is of non stop 51hrs by SUNIL PRABHAKAR of India when he broke previous record of 40hrs of Tony wright of UK. His new record is monitored by Telecom Giant TATA http://longestphoneconversation.com/

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15y ago

The longest telephone call is still going on, even though the two people who started it are both dead! The phone call was started during the second world war, as a hotline between the British and American governments. Because the line was of such vital use, engineers had to work constantly to make sure it was still working - it breaking for a moment could have spelled disaster!. To ensure this, the engineers started a test call alongside the main-line, which they kept going throughout the entire war. Engineers would repeat series of numbers to each other, and note down the response from the other end as proof the line was working. Later, the line was also used to exchange coded messages in a similar way. Even after the war ended, the never-ending phone call continued, through the cold war and to the present day. Engineers still work in shifts, to make sure the trans-Atlantic undersea link is still active - vital for the operation of the modern internet!

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12y ago

UK telephone numbers mostly have 9 or 10 digits after the +44 country code.

Tens of millions of numbers are all the same length at 10 digits.

There are however two numbers that are very much shorter than the rest:

0800 1111 and 0845 46 47.

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14y ago

the longest phone number is 983-49552-072886-117309-5773

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Jackson Jackson

Lvl 1
2y ago
983-49552-072886-117309-5773

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Wiki User

11y ago

The best guess is probably 14 numeric digits but when written down with the + () - spaces and other characters about 21 works.

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6y ago

A landline local call on a party line, pre-1960s.

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Jackson Jackson

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2y ago

983-49552-072886-117309-5773

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Alena Robel

Lvl 1
2y ago
Oh ok

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Jackson Jackson

Lvl 2
2y ago

983-49552-072886-117309-5773

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Alexander Arthur

Lvl 2
1y ago

65456765456787656787654566666666666666666

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Q: What is the longest phone number?
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