SMS Sender IDs¶

SMS Sender IDs control the "from" name or number shown on SMS messages sent from Lime Marketing. Only sender IDs that have been verified and enabled can be used for sending.

Why verification is required¶

Previously, Lime Marketing allowed free-text entry of sender IDs when creating SMS messages. As telecom regulators and carriers have tightened enforcement, unregistered sender IDs are now frequently blocked or rejected. Lime Marketing now requires all sender IDs to be pre-registered and verified before use.

Unverified sender IDs cannot be used

SMS messages — both campaign and transactional — will be rejected if the sender ID has not been verified and enabled. There is no fallback to a default value.

Sender ID format¶

Lime Marketing supports alphanumeric sender IDs — a brand or company name shown as the sender of the SMS.


Example	`MyBrand`
Length	3–11 characters
Allowed characters	Letters (a-z, A-Z), digits (0-9), hyphens, underscores, and spaces. Nordic characters (åäöÅÄÖæÆøØ) are accepted but may be removed or replaced with ASCII equivalents by some carriers — safest to avoid.
Restrictions	First and last character cannot be a space

Managing Sender IDs¶

Sender IDs are managed under Settings > SMS Sender IDs by administrators.

Adding a Sender ID¶

Navigate to Settings > SMS Sender IDs
Enter the sender ID value
Click Add sender ID

The sender ID is created but cannot be used until verified.

Verification and registration¶

To get a sender ID verified — or to register it for a specific country — contact support@lime.tech with your organization name, the sender ID, and which countries you intend to send to.

If you're only targeting countries that don't require registration, verification is quick. For countries that do require registration, the process takes longer and will involve effort from your company — Lime will guide you through it, but expect to provide documentation before the sender ID can be verified. See country-level sending rules for which countries require registration and which don't support alphanumeric sender IDs at all.

Once verified by Lime:

The sender ID is enabled and appears in the sender selection when creating SMS messages
If no default exists, it becomes the default

Default Sender ID¶

One sender ID per organization is marked as default. It is automatically selected when creating new SMS messages.

Info

The default sender ID cannot be deleted or unverified. To change the default, set another verified sender ID as default first.

Country-level sending rules¶

Many countries require sender IDs to be registered with a national authority before SMS messages can be delivered. Lime Marketing enforces these rules automatically.

Default: blocked

Countries that are not explicitly listed below are blocked by default. If you need to send to a country not listed here, contact support.

How it works¶

Every outgoing SMS is checked against the destination country's rules. If the country requires registration and the sender ID isn't registered there, the message is blocked. If registration is recommended but missing, the message is sent but delivery may be degraded — carriers may overwrite or filter the sender ID.

Countries with registration requirements¶

Countries where the sender ID must be registered before messages can be delivered. Unregistered sender IDs are blocked.

Info

Some countries may impose fines for sending with unregistered sender IDs. This is why Lime Marketing automatically blocks messages to markets that require registration — so you don't accidentally send to a country where your sender ID isn't registered.

Country	Alphanumeric	Numeric	Notes
Spain	Mandatory	None	CNMC registration required.
Finland	Mandatory	Mandatory	Traficom. Both sender types require registration.
Ireland	Mandatory	None	ComReg. Customer self-registers via ComReg portal.
Australia	Mandatory	None	ACMA. Unregistered IDs shown as "Unverified".
Singapore	Mandatory	Mandatory	SSIR/SGNIC. Fees apply.
Croatia	Mandatory	Mandatory	Must have local entity for domestic traffic.
Serbia	Mandatory	None	All operators require registration.
N. Macedonia	Mandatory	Blocked	Local company registration needed. No numeric senders.
India	Mandatory	Mandatory	TRAI/DLT. 6-character headers, template pre-approval.
Saudi Arabia	Mandatory	Mandatory	Template approval required.
UAE	Mandatory	Mandatory	TDRA. AD- prefix for Abu Dhabi numbers.
Turkey	Mandatory	Mandatory	IYS. URLs prohibited for international senders.
Philippines	Mandatory	Mandatory	Unregistered IDs permanently blocked.
Indonesia	Mandatory	Mandatory	Local business license required.
Vietnam	Mandatory	Mandatory	Local business license required.
Nigeria	Mandatory	Mandatory	Pre-registration required.
China	Mandatory	Mandatory	Business license required. No URLs in content.
Thailand	Mandatory	Blocked	LOA required. URL whitelisting. Alphanumeric only.

Countries with recommended registration¶

Messages are allowed through without registration, but delivery may be degraded — carriers may overwrite or filter the sender ID.

Country	Alphanumeric	Numeric	What happens without registration
France	Recommended	None	ARCEP. Unregistered IDs may be filtered.
Italy	Recommended	None	Sender ID replaced with a local phone number.
Czech Republic	Recommended	None	Sender ID overwritten with a generic sender.
Romania	Recommended	Recommended	Vodafone: not delivered. Orange/Digi: overwritten to short codes.
Bulgaria	Recommended	Recommended	Some operators overwrite unregistered sender IDs.
Belarus	Recommended	Blocked	Alphanumeric only. No numeric senders.
Montenegro	Recommended	None	Telenor requires registration for domestic traffic.

Countries where alphanumeric sender IDs are not supported¶

Messages with alphanumeric sender IDs are blocked. Numeric senders may still work where noted.

Country	Numeric	Notes
United States	Mandatory	Must use 10DLC or toll-free numbers.
Canada	Mandatory	Toll-free numbers only.
Belgium	None	All alphanumeric IDs replaced with short codes. Numeric works.
Hungary	None	All senders converted to numeric.
South Korea	None	All senders overwritten.
Malaysia	None	All senders overwritten.
Azerbaijan	Blocked	All sender types blocked. Do not offer.

Countries with no registration required¶

These countries allow sending immediately with any verified sender ID — no country-specific registration needed.

How do I know if my sender ID is registered?¶

There is currently no way to check this in Lime Marketing. If your sender ID is verified and you're already sending successfully to a country, it means either:

The country doesn't require registration (most European countries), or
Lime has already registered the sender ID on your behalf (e.g. Finland, Spain)

If your sender ID is verified in Lime Marketing, it is safe to use for your current markets. For new sender IDs or new markets that require registration, contact support@lime.tech.

Plan ahead

Registration lead times vary by country — from a few days to several months. Start the process well before you need to send.