Smart Number Prefixes — What Your Word Can Ride On

A smart number — a word spelled on an inbound number — always starts with one of three prefixes: 13, 1300 or 1800. The prefix is the family the word rides on, and it decides three things at once: the format the word must fit, the caller arrangement behind it, and the plan that carries it. This page walks the three prefixes as smart-number choices.

The three prefixes, as word bases

Prefix	Word limit	Caller arrangement
13	Up to 4 letters	Short six-digit format; typically used by larger national companies per the published FAQ
1300	Up to 6 letters	Shared cost — caller pays a local call cost, business pays the remainder
1800	Up to 6 letters	Caller-free in the stated Australian 1800-number context; business pays call charges

The keypad mapping is identical across all three — 2 ABC through 9 WXYZ — so the word itself is prefix-agnostic: 1300 327 934 spells 1300 EASY DIAL, and the same mapping works on any base.

How the prefix shapes the word choice

Four-letter words suit the 13 format; six-letter words fit the 1300 and 1800 tails. The same brand can live differently on each: a name that truncates awkwardly at six letters might read perfectly at four, or the other way round. Search available 1300/1800 Phonewords to see which bases your candidates actually ride on — a specific word is not guaranteed until sign-up confirms it.

How the prefix shapes the caller and the bill

On a 1300 base, callers contribute a local call cost. On an 1800 base, they pay nothing in the Australian context and the business carries the call charges — which is why the plan's rate table deserves reading either way. Plans run from $10 per month; a word adds a component from $40 per month with availability and desirability affecting the price of the specific word.

Matching the word to the prefix in practice

The practical method: write the word, count the letters, and let the count nominate the prefix — four letters or fewer opens the 13 format, six or fewer opens 1300 and 1800, and anything longer needs shortening before it fits any base. Then let the caller arrangement break any tie: the same word on a 1300 base behaves differently for callers than on an 1800 base, and the rate tables on the pricing page price that difference. Word fit and caller fit are the two halves of the prefix decision.

What the prefix does not do

It does not carry geography — the inbound prefixes have no area-code meaning, and the published pages make no coverage claims. And it does not change the word: the mapping, limits aside, is the same family-wide.

Related reading: what Australian numbers start with for the full prefix picture, the smart numbers Australia pillar, or the smart numbers Australia guide.

Prefix questions

Can a smart number start with anything else?

In the published family here, no — smart numbers ride 13, 1300 or 1800. Geographic area-code numbers are a different product, not sold on this site.

Does the prefix change what the word costs?

The word component follows the same published rule on any base — from $40 per month with availability and desirability affecting the figure. The plan differs by base.

Can the same word exist on two prefixes?

If both are available, yes — the mapping works on any base. The search shows what exists; confirmation secures one.

Which prefix is best for a new smart number?

The caller arrangement decides it: shared cost (1300) or caller-free (1800) in the Australian context. The published rate tables make the trade-off concrete.