Docs

Yes, absolutely! Simply register with us and you’ll receive free trial access right away.

You will get:

A demo sender ID: TextLKDemo

10 free SMS units to test the system

Full access to the web dashboard, API, and all features

Step-by-step demo videos available directly in your dashboard

No payment required. It’s completely free to try!

No, there are no starting fees on Text.lk SMS Gateway Service in Sri Lanka. You simply pay as you go or can choose freedom plans according to your SMS usage.

Our demo gives you access to explore Bulk SMS, SMS API, WhatsApp Business API, OTP verification, and Partner tools. Also, you can access SMS sending plugins or modules such as WordPress, WooCommerce, Shopify, PHP, Laravel, NodeJS, etc. You can test the platform features before making a purchase.

Yes, the demo is completely free and does not require payment or a credit card. You can try it risk-free.

No. All taxes and fees are included in our package prices. There are no hidden charges, no monthly fees in Starter Free package, and your SMS units never expire.

The demo environment is designed for testing. Some features use a Sandbox mode, where delivery is simulated for security. For live SMS delivery, you need to upgrade to a paid account.

No, our platform is designed to be easy to use. Developers can test APIs, while business users can send campaigns directly from the dashboard.

Yes, resellers can sign up for a Reseller demo account to explore white-label branding, browser extensions, and client management features.

A Sender ID (Mask) is the name that appears as the “From” address on a SMS message, identifying the sender to the recipient. It can be an alphanumeric string, which is often a company name. Sender IDs can be used for branding and to help customers recognize who sent the message. Learn More. 

No. TextLKDemo is strictly for testing purposes only. It must not be used to send OTPs or any production-related messages. Violating this policy may lead to account suspension. Always use an approved sender ID for live messaging.

You can request your new Sender ID from the “Sender ID” section under the Sending tab in your dashboard. Clear step-by-step guidelines are provided there to help you complete the process easily.

Sender ID approvals usually take a few hours to 1 business day. However, in some cases, it may take up to 3 business days. If you need it urgently, you can request fast-track (no additional cost) approval.

Simply go to the “Top-up” tab in your Dashboard, where you’ll find all your financial information. You can reload your account using Credit Cards or through a Bank Transfer, whichever is convenient for you.

Flash SMS (Class 0 SMS) is a type of message that appears instantly on the recipient’s screen instead of going to the inbox.

It is designed for urgent, high-visibility communication and is usually not stored on the device by default.

• Flash SMS appears instantly as a popup
• Normal SMS goes to the inbox
• Flash SMS is usually not saved
• Normal SMS is stored and can be revisited

👉 Flash SMS = visibility
👉 Normal SMS = persistence

Use Flash SMS when:

• Sending OTP codes
• Delivering security alerts
• Notifying urgent updates
• Sharing time-sensitive information

Avoid using it for marketing or long messages.

Not 100%.

• Most GSM devices support it
• Some smartphones may:
• Save it like a normal SMS
• Not display it as a true popup

👉 Behavior may vary by device and OS.

Partially.

✔ Good for quick delivery

❌ But has risks:

• Visible on lock screen
• Can be seen by others nearby
• No message history

👉 Use carefully for sensitive data.

Usually no.

• Once dismissed, the message is gone
• Some devices may still store it (rare cases)

Very unlikely. But possible.

• It appears instantly
• But if dismissed accidentally, it may be lost permanently

In most cases, no. Pricing is typically the same as standard SMS in Text.lk 

You can send Flash SMS in 3 ways:

• Send Flash SMS using Quick Send
• Send Flash SMS using Bulk SMS Campaign Builder
• Send Flash SMS using Text.lk API
• Learn how to send Flash SMS. 

Yes.

Method 1: Use Quick Send SMS:

• Enter recipient number
• Type your message
• Enable Flash SMS option
• Click send

👉 Best for manual sending and testing.

Method 2: Use the Bulk SMS Campaign Builder:

• Upload contact list
• Create your message
• Enable Flash SMS mode
• Send campaign

👉 Use responsibly to avoid user annoyance in Campaign Builder.

Method 3: Use Text.lk API:

👉 Read docuemntion for learn How to send Flash SMS via Text.lk API 

Simply add this parameter:

"is_flash": true

👉 Read docuemntion for learn How to send Flash SMS via Text.lk API   

No.

• Use the same SMS endpoint
• Just add "is_flash": true

Use OAuth 2.0 (Bearer Token).

• ✔ More secure
• ✔ Recommended for production

Use HTTP GET only for:

• Testing
• Legacy systems

No.

• It can feel intrusive
• May annoy users
• Not suitable for promotions

👉 Use only for critical communication.

• Instant visibility
• Very high open rate
• Ideal for urgent alerts
• No storage on device

• Privacy concerns (lock screen visibility)
• No message history
• Can be intrusive
• Device compatibility varies

The Text.lk SMS Units Calculator is a tool that helps you calculate SMS length, encoding type, and message segments to understand how many SMS units your message will consume.

It analyzes your message characters, detects GSM7 or Unicode encoding, and calculates how many SMS parts (segments) are required to send your message.

• 7-bit (GSM-7) encoding supports standard Latin characters and allows up to 160 characters per SMS.
• Unicode (UCS-2) supports global languages and emojis but reduces the limit to 70 characters per SMS due to larger encoding size.

SMS character count directly affects both cost and message delivery. Standard SMS messages are limited to 160 characters (or 70 characters for Unicode). When messages exceed these limits, they are split into multiple parts, and each part is charged separately. This can increase costs and affect how your message is delivered, so keeping messages optimized is important.

Yes. When a message exceeds the single SMS limit, it is split into multiple segments, and each segment is billed separately. This can significantly increase costs, especially in bulk messaging campaigns. Optimizing message length helps reduce unnecessary expenses.

Yes. The Text.lk SMS Calculator helps identify convertible characters and allows you to optimize your message to GSM7 where possible to reduce SMS costs.

Yes. Longer messages or Unicode messages may be split into multiple SMS units, increasing the total cost.

The SMS calculator helps you understand how your message will be sent before you actually send it. It shows character count, encoding type, and how many SMS segments will be used. This allows you to optimize messages, avoid unnecessary multipart SMS charges, identify special characters and improve message for better ROI and deliverability.

Yes. Emojis automatically switch the message to Unicode encoding, which reduces the character limit from 160 to 70 per SMS. This means your message may be split into more parts, increasing cost. That’s why it’s important to use emojis carefully in SMS campaigns.

To keep messages within one SMS, avoid unnecessary special characters and emojis. Try to stay under 160 characters for GSM-7 messages or 70 characters for Unicode. You can also use the SMS Length Calculator to preview how your message will be split before sending.