Phone prefixes in Ajax-Pickering, ON

In numbers

In-service prefixes

78

Telephone numbers covered

780,000

Carriers

19

Area codes

4

Provinces and territories

1

First assignment

December 22, 1999

Most recent assignment

March 18, 2026

Ajax-Pickering’s share of its area codes

Within area code 289, Ajax-Pickering accounts for only 29 of 772 prefixes (3.8%): the code is dominated by Hamilton and spread over 87 rate centres. Within area code 905, Ajax-Pickering accounts for only 22 of 773 prefixes (2.8%): the code is dominated by Hamilton and spread over 94 rate centres. Within area code 365, Ajax-Pickering accounts for only 21 of 706 prefixes (3.0%): the code is dominated by Markham and spread over 88 rate centres. Within area code 742, Ajax-Pickering accounts for only 6 of 149 prefixes (4.0%): the code is dominated by Brampton and spread over 68 rate centres.

Who holds these numbers

TELUS Mobility holds the largest share at 14 prefixes, 17.9% of the total, ahead of 18 other carriers. Code by code: in 289, TELUS Mobility leads with 4 of 29 prefixes ahead of 13 others; in 905, Bell Canada leads with 7 of 22 prefixes ahead of 4 others; in 365, Iristel Inc. leads with 8 of 21 prefixes ahead of 10 others; in 742, TELUS Mobility leads with 3 of 6 prefixes ahead of 3 others. 1 carrier holds prefixes in every one of Ajax-Pickering’s 4 area codes, while 10 appear in just one.

Wireless and wireline

32 of Ajax-Pickering’s 78 prefixes (41.0%) are held by carriers whose registered name marks a wireless business: TELUS Mobility, Bell Mobility, Rogers Communications Canada Inc. (Wireless) and Fido Solutions Inc. Wireline prefixes still outnumber them, carried by Iristel Inc, Bell Canada, Rogers Communications Canada Inc. (Cable) and Distributel. This is a sort by name, not a licence lookup, and a mobile prefix may have been ported to another network since.

How the allocation was built up

Ajax-Pickering’s dated assignments run from 1999 to 2026. The busiest period was 2020–2024, when 15 prefixes went to 7 carriers. 11 prefixes (14%) carry no date in the register: these are the historic pre-1999 assignments, the wireline bedrock of the rate centre. Since 2020 another 17 prefixes have been added, so the rate centre is still growing.

Ajax-Pickering’s oldest prefixes, the ones the register leaves undated, belong to Bell Canada, TELUS Mobility and Bell Mobility: these carriers made up the landscape before competition arrived. The first dated assignment went to TELUS Mobility in 1999. The most recent arrivals are Cogeco Connexion Inc. (2025), Beanfield Technologies Inc. (2021) and TekSavvy Solutions Inc (2021), a sign that new carriers are still asking for numbers in Ajax-Pickering.

Ajax-Pickering’s 78 prefixes provide 780,000 numbers, which corresponds to a mid-sized city or a well-established suburb that every major carrier wants a slice of.

No single carrier dominates Ajax-Pickering: the leader, TELUS Mobility, holds only 17.9% of the prefixes against 18 competitors, a sign of a highly fragmented market where cable companies, mobility brands and VoIP providers weigh as much as the incumbent.

Demand remains steady: 25.4% of the dated prefixes go back to the last ten years, the most active period being 2020–2024. The rate centre is growing at a regular rather than explosive pace.

11 undated in the register.

Dialling a Ajax-Pickering number

Ajax-Pickering is served by 4 overlaid area codes (289, 905, 365 and 742). A 742 number is no more “out of town” than a 289 one; from abroad, dial +1 and the full ten digits.

The numbering neighbourhood

Ajax-Pickering shares area codes 289, 905, 365 and 742 with at least 20 other rate centres, including Hamilton, Brampton, Oshawa, St. Catharines-Thorold, Oakville, Markham, Cooksville and Thornhill. The largest of them, Hamilton, holds 222 prefixes in 289, 365, 742 and 905; the smallest on the list, Maple, has just 28.

What a Ajax-Pickering number tells you

A number attached to Ajax-Pickering tells you that its prefix was issued to a carrier for this rate centre in Ontario, most often TELUS Mobility. It does not tell you where the handset is today: a subscriber may have ported the number to any of the 19 carriers present here or to a VoIP service usable anywhere. Nor does it tell you who is calling: caller ID can be spoofed, and an Ontario area code is easy to borrow to look local.

Reading a register entry for Ajax-Pickering: code 289-423 is recorded for TELUS Mobility, so every 289-423-XXXX number (10,000 possible) descends from that assignment. “Ajax-Pickering, Ontario” there names a rate centre, not a municipality, and several area codes overlay it.

Every Ajax-Pickering prefix

Each row is an in-service central-office code recorded for Ajax-Pickering, with its original holder and year of assignment.

What people check and report about Ajax-Pickering numbers

Searches typed into this site's lookup form since July 28, 2026, plus the verdicts and moderated reports visitors left. A search usually follows a missed call.

Checks

34

Different numbers

31

Different people

30

Had a call from a Ajax-Pickering number?

No clear pattern in reports on these numbers yet. If a call worried you:

1. Call back on a number you trust

   If a caller says they are your bank, the Canada Revenue Agency, a courier or your phone company, hang up and call the organization on the number from its website or your statement, never the number that called you. Caller ID can be faked.

2. Report the fraud

   Report the call or text to the Canadian Anti-Fraud Centre online or at 1-888-495-8501. If you lost money or gave out personal details, tell your bank first, then your local police.

   Report to the Canadian Anti-Fraud Centre ↗

3. Register on the National Do Not Call List

   Registering a landline or mobile on the National DNCL is free. Registered charities, political parties, newspapers and companies you already do business with may still call.

   National Do Not Call List ↗Who can still call you ↗

4. Forward suspicious texts to 7726

   Forward a scam or spam text to 7726 (SPAM on the keypad). It's free, and your carrier uses it to block the sender. Don't tap links or reply.

   Get Cyber Safe: forwarding to 7726 ↗

Allocated prefixes

All 78 in-service prefixes, grouped by rate centre.

Elsewhere in Ontario