What format do South African phone numbers use?

Domestic South African numbers are 10 digits and always start with 0, written as 0XX XXX XXXX. The country code is +27 (or 0027), so in E.164 the leading 0 is dropped, giving +27 XX XXX XXXX — 12 characters in total including the plus sign.

How do I write a South African mobile number in E.164?

Replace the leading 0 with +27. For example, 082 555 1234 becomes +27 82 555 1234 in display form or +27825551234 as a bare E.164 string. Networks 06X, 07X and 08X (081–085) are all mobile; geographic landlines start 010–059.

What do the 0XX area codes mean?

The first three digits identify the network or region: 011 is Johannesburg, 021 is Cape Town, 031 is Durban, 041 is Gqeberha (Port Elizabeth). Mobile prefixes 060–069 are Cell C and Telkom Mobile, 071–079 are Vodacom, 081–085 are MTN and Vodacom. 0800 is toll-free; 086X is shared-cost; 087 is VoIP.

Is 083 a Vodacom or MTN number?

083 is an MTN prefix. Vodacom primarily uses 082 and 071–074. Cell C uses 084 and 085. These assignments can change as ICASA (the South African regulator) reallocates ranges, but 082 Vodacom and 083 MTN have been stable for many years.

Why does the validator not tell me if the number is active?

Structural validation only checks that the format, length and prefix are valid — it does not make a network query. Confirming whether a specific subscriber line is live requires a carrier lookup or a real SMS/call attempt, which would need a network connection and your consent.

Can I validate numbers from other countries here?

This tool is South Africa-specific. If you enter a number with a different country code (e.g. +44 for the UK) the validator flags it immediately. For multi-country validation consider combining it with a broader E.164 parser in your application code.

South Africa Phone Number Validator

South Africa uses a clean, predictable numbering plan governed by ICASA (the Independent Communications Authority of South Africa). Every domestic number is exactly 10 digits in local form, always starting with 0. The country code is +27, so in international E.164 notation the leading zero is simply replaced by +27. What looks confusing at first — a dozen different 0XX codes for one country — follows a consistent rule once you know the prefix table.

This validator checks all three common input formats (local 0XX, E.164 +27XX, and the bare 27XX trunk without the plus), normalises to the canonical local form, verifies the total length, and then looks up the first three or four digits against the official ICASA prefix allocation table to identify the network or geographic region.

How it works

The algorithm has four steps:

Strip and normalise. Spaces, dashes, dots and parentheses are removed. Numbers starting with +27 or 0027 have the country code replaced with 0 to yield the 10-digit local form. Bare 9-digit strings (common when copy-pasting from international databases that dropped the leading zero) are also accepted by prepending 0.
Length check. The normalised string must be exactly 10 digits. South Africa has no 8-digit or 11-digit domestic numbers; any deviation indicates a mistype or a truncated paste.
Prefix lookup. The first three digits (0XX) are matched against the ICASA allocation table. For the 080X and 086X shared-cost and toll-free sub-ranges, a four-digit prefix (0XXX) lookup provides a more specific label. If no match is found the number fails — unallocated prefixes like 019, 025, 026 or 029 do not exist in the South African numbering plan.
E.164 and formatted output. On success the validator produces three ready-to-copy strings: the E.164 form (+27XXXXXXXXX), the raw local form (0XXXXXXXXX) and the spaced human-readable form (+27 XX XXX XXXX).

Worked example

Suppose you have the string (082) 555-1234 from a web form. The validator strips the parentheses and dash to get 0825551234, confirms it is exactly 10 digits, matches the prefix 082 to Vodacom mobile, and outputs:

Field	Value
E.164	+27825551234
Local	0825551234
Human-readable	+27 82 555 1234
Network	Vodacom mobile
Type	mobile

Now try +27 11 530 5000 (a Johannesburg landline). After stripping spaces and converting the +27 prefix the local form is 0115305000. The prefix 011 resolves to Johannesburg / East Rand (geographic), confirming it is a fixed-line number, not a mobile.

Finally, 0800 123 456 normalises to 0800123456. The four-digit prefix 0800 matches the toll-free sub-range, so the validator labels it Toll-free (0800) — useful when you need to flag free-to-call numbers in a CRM or dialler system.

Why prefix validation matters

Many international phone-number libraries skip South Africa’s internal structure and accept any 10-digit string starting with 0. That lets through numbers like 0191234567 or 0251234567 which have never been allocated and will never connect. Prefix validation catches these silently invalid entries at the point of data capture, before they pollute a database or trigger a wasted API call to a carrier lookup service.