SG Alert and 2G-off rules: what to check on a new phone

If you are buying a phone in Singapore this year-end, two IMDA handset rules decide how it behaves out of the box. Since 1 April 2026, handsets must handle SG Alert emergency messages, which arrive at full volume, override Do Not Disturb and cannot be switched off. From 31 December 2026, handsets must also ship with 2G switched off by default. Both rules come from IMDA's technical specification for mobile phones, revised in March 2026, and both exempt models that reached end of life before the relevant date.

Most buyers will never touch either setting, but they matter when you buy a parallel import, a second-hand phone or a cheap handset for a parent, and when an alert goes off in a cinema. Here is what the specification requires, what it does not say, and a short check to run before you pay.

What does SG Alert do on my phone?

The specification sets out how a phone must treat emergency messages sent by cell broadcast. Its configuration table names two alert types.

SG Alert:

• enabled by default, and the user cannot opt out
• overrides Do Not Disturb mode
• plays at maximum volume

Test Alert:

• off by default, and the user can switch it on or off
• follows the phone's own volume and does not override Do Not Disturb

Both types use a 10.5-second notification and the same fixed pattern: one two-second tone, then two one-second tones, half a second apart, with the whole sequence repeated twice and matched by vibrations.

Compliant phones must also show the warning without the user tapping anything, keep alerting until the user dismisses it, let you review earlier alerts until you delete them, support messages of up to 1,395 characters in more than one language, and open a web link or phone number inside a message. Alerts take priority over other functions but must not cut into a call or data session already in progress.

The specification governs the phone, not the sender. It does not say who issues SG Alert messages, when, or on which networks, and the agency pages we tried for those details could not be opened from our desk.

Why switch 2G off, and what changes for buyers?

Section 5.2.3 of the specification says 2G must be off in the factory default configuration, and the phone must not connect or try to connect to 2G networks unless the user deliberately turns it on, for example through a settings menu or a confirmation prompt. IMDA's pages that we read do not give a reason for the rule.

For a buyer, the practical points are:

• A phone sold here after 31 December 2026 should arrive with 2G off. You should not need to do anything.
• The setting can still exist. The specification lets a user enable 2G deliberately, so a phone that offers a 2G toggle is not automatically non-compliant.
• The exemption covers models that reached end of life before the date. IMDA's page does not say whether phones already sold must be updated, so do not assume an older handset will receive a change.

How do I check a phone before I buy it?

Run this check in the shop, or on delivery before the return window closes:

1. Ask whether the model is registered for sale in Singapore. IMDA's equipment registration page says telecommunication equipment sold for local use must be registered, that mobile phones fall under its Simplified Equipment Registration scheme, and that only holders of a telecommunication dealer's licence may apply. Our inference: a model registered for local sale is the one these rules were written for.
2. Open the emergency alert settings. On a compliant phone you should find SG Alert switched on with no way to turn it off, and a separate Test Alert option that is off until you enable it. The menu name varies by maker.
3. Check the 2G setting. Leave it off unless you have a specific reason. On phones sold after 31 December 2026 it should already be off.
4. Make a test call. VoLTE should be on by default; if calls fail on a 4G or 5G network, ask the seller before the return period ends.
5. Keep the paperwork. If a parallel import or second-hand phone behaves differently from the local model, the receipt and the seller's description are what you will rely on. Our used phone guide covers the rest of that handover.

If you are pricing a handset from an overseas website, remember it may be a model made for another market, and our GST overseas purchase calculator shows what you may pay on top.

What about phones for parents and grandparents?

An SG Alert that sounds at full volume through Do Not Disturb can startle someone who has not heard it before. Before you hand over a new phone, show where earlier alerts can be read again, and explain that the alert cannot be silenced in settings; it stops when dismissed.

If the phone comes through IMDA's subsidised scheme for lower-income seniors, see our guide to the Mobile Access for Seniors plans and phones. For choosing between models more generally, the comparing topic has our other checklists.

What these pages do not settle

We read IMDA's specification and its standards page. They do not list which models comply, do not say how the rules apply to phones bought abroad for personal use, and do not explain the reason for the 2G rule. If a model's compliance matters to you, ask the seller in writing, and treat any claim that a phone is "IMDA approved" as something to check against the registration route above.

Common questions