The following are the telephone codes in Tanzania.

• +255 XXX XXX XXX +255XX XXX XXXX calling from outside Tanzania
• 0XXX XXX XXX or 0XX XXX XXXX - calling within Tanzania

The NSN length is nine digits.

• Subscriber Number length under 2X, 4X, 6X and 7X NDCs is 7 digits.
• Subscriber Number length under 8XY and 90X NDCs is 6 digits.

Calls to Kenya and Uganda require a regional prefix rather than having to use full international dialling. To call Kenya from Tanzania, subscribers dial 005 instead of +254, while to call Uganda, they dial 006 rather instead of +256. To call Tanzania from Kenya and Uganda, subscribers dial 007 instead of +255.

Until 1999, Tanzania, Kenya and Uganda shared a telephone numbering plan, in which subscribers were only required to dial the trunk code, area code and number. In that year, Tanzania adopted a new numbering plan.

VoIP services begin with 41:

Non-geographic numbers for Corporate Networks start with 5.^[3]

See also Telecommunications in Tanzania#Telephones

Mobile numbers start with 6 or 7:

Non-geographic numbering begins 8 or 9: