Viettel number prefixes
Viettel prefixes in Tanzania: 611, 621, 631. Number format +255 611 XXX XXX.
611
- Country
Tanzania +255- Prefixes
- 611, 621, 631
- Number format
- +255 611 XXX XXX
- Within the country
- 0611 XXX XXX
- Number ranges
- 61, 62, 63
A prefix shows which operator a number range was originally assigned to. In many countries subscribers can port their number to another operator, so the prefix does not guarantee the current operator.