What Is SMS Encoding and How It Impacts Message Cost
In the world of international business communication, SMS remains one of the most reliable and effective channels for customer engagement. Whether companies are sending OTP verification codes, promotional campaigns, transaction alerts, or iGaming notifications, SMS continues to deliver unmatched open rates, instant reach, and global accessibility.
However, many businesses overlook one critical technical factor that directly affects SMS delivery performance and messaging expenses: SMS encoding.
At Texcell Messaging, we help enterprises optimize their global messaging strategies through high-quality routes, intelligent delivery solutions, and deep technical expertise. Understanding SMS encoding is essential for businesses that want to control costs while maintaining excellent delivery quality.
What Is SMS Encoding?
SMS encoding refers to the way text characters are converted into digital data before being transmitted through mobile carrier networks.
The two most common SMS encoding formats are GSM-7 encoding and Unicode encoding.
GSM-7 encoding is the standard format used for most English-language SMS messages. It supports common Latin characters, numbers, and symbols. When using GSM-7 encoding, a single SMS can contain up to 160 characters.
Unicode encoding is automatically triggered when a message includes special characters, emojis, Chinese characters, Arabic text, accented letters, or certain symbols not supported by GSM-7. Unicode messages can only contain 70 characters per SMS segment.
This technical difference has a major impact on SMS cost calculation, especially for businesses sending high-volume international bulk SMS campaigns.
Why SMS Encoding Matters for Businesses
Many companies focus only on SMS pricing per route without realizing that message encoding can significantly increase total messaging costs.
For example, a marketing message written in GSM-7 encoding may fit into one SMS segment. However, adding a single emoji or unsupported character can automatically convert the entire message into Unicode SMS, reducing the character limit and splitting the message into multiple segments.
More segments mean higher delivery costs.
For businesses running OTP authentication systems, flash sales, banking alerts, or iGaming promotions, these hidden costs can scale rapidly when sending millions of messages globally.
This is why professional SMS providers like global SMS gateway platforms must carefully monitor encoding optimization.
GSM-7 vs Unicode SMS
GSM-7 Encoding
GSM-7 encoding is ideal for standard English content and cost-efficient messaging. It allows:
- 160 characters per single SMS
- Lower messaging costs
- Better compatibility across carrier networks
- Faster message processing
Businesses using OTP verification codes and transactional notifications often prefer GSM-7 encoding because it maximizes efficiency and minimizes delivery expenses.
Unicode SMS
Unicode SMS is necessary for multilingual communication. It supports:
- Chinese characters
- Traditional Chinese
- Arabic
- Cyrillic languages
- Emoji content
- Special international symbols
Although Unicode SMS enables global communication, it reduces the character limit to 70 characters per segment, which increases SMS cost.
For companies operating in Southeast Asia, Latin America, the Middle East, and multilingual European markets, understanding Unicode SMS behavior is essential for campaign budgeting.
How SMS Segmentation Affects Pricing
SMS messages exceeding the single-message character limit are automatically divided into multiple segments.
For GSM-7 encoding:
- 1 segment = 160 characters
- Multipart SMS = 153 characters per segment
For Unicode SMS:
- 1 segment = 70 characters
- Multipart SMS = 67 characters per segment
This means a seemingly short multilingual marketing message could actually be billed as multiple SMS messages.
At Texcell Messaging, our technical team helps clients optimize SMS templates, remove unnecessary Unicode triggers, and improve SMS throughput efficiency across global carrier routes.
SMS Encoding in OTP and iGaming Messaging
Encoding optimization is especially important for OTP verification and iGaming traffic.
OTP messages require extremely fast delivery and concise formatting. By using GSM-7 encoding whenever possible, businesses can reduce latency and lower operational costs while maintaining high delivery rates.
For iGaming operators, SMS campaigns often include localized promotional content across multiple countries and languages. In these cases, Unicode SMS becomes unavoidable. However, message structure optimization can still significantly reduce campaign expenses.
Texcell Messaging provides scalable international bulk SMS solutions designed for:
- OTP verification codes
- Marketing SMS campaigns
- Member notifications
- iGaming promotions
- Financial alerts
- E-commerce engagement
How Texcell Messaging Helps Optimize SMS Costs
As an experienced international messaging provider, Texcell Messaging helps businesses improve both SMS delivery quality and cost efficiency.
Our platform includes:
- Global direct SMS routes
- High-throughput delivery infrastructure
- Encoding optimization support
- Real-time delivery monitoring
- Advanced routing management
- Worldwide carrier coverage
By understanding how SMS encoding works, businesses can avoid unnecessary segmentation, improve customer experience, and maximize ROI from their messaging campaigns.
Final Thoughts
SMS encoding may appear to be a small technical detail, but it has a direct impact on message cost, delivery performance, and campaign scalability.
Businesses sending international bulk SMS should carefully monitor character usage, Unicode triggers, and segmentation behavior to avoid hidden expenses.
With the support of Texcell Messaging global SMS solutions, companies can optimize worldwide messaging performance while maintaining reliable delivery across OTP, marketing, and iGaming scenarios.
Ready to optimize your SMS campaigns? Get started now and explore professional global messaging solutions with Texcell Messaging.
