Stop Unicode From Splitting Your SMS: Complete Guide

If you have noticed your SMS billing costs skyrocketing because your system will only send multiple sms due to unicode how to stop this is likely the most urgent question on your mind. A single accidental smart quote or emoji can instantly turn a standard, low-cost text message into three separate billed segments, draining your marketing and operations budget.

Step 1: Understand Why Unicode Forces Multiple SMS Segments

To stop your SMS gateway from splitting single messages into multiple billed segments, you must first understand the underlying technical mechanics of SMS encoding. Traditional telecommunications networks use two main encoding standards for text messages: GSM-7 and UCS-2 (Unicode).

Under the standard GSM-7 encoding, a single SMS segment can contain up to 160 characters. This character set includes standard Latin letters (A-Z, a-z), numbers (0-9), and a few common punctuation marks. However, the moment your message payload contains even a single character outside this basic set—such as a curly quote (’), an accented letter (á, é, ö), or an emoji—the entire message encoding automatically switches to UCS-2.

When your message switches to UCS-2 Unicode encoding, the character limit per segment drops from 160 characters to just 70 characters. If your message is 140 characters long, it fits easily into a single GSM-7 segment. But in UCS-2, those same 140 characters require two separate segments. Traditional API providers like Twilio, Vonage, and MessageBird bill you per segment, meaning your cost instantly doubles or triples for a single message.

This behavior explains why your application will only send multiple SMS due to Unicode. To solve this, you either need to strictly sanitize your input data or transition to a low cost sms api that does not penalize you for sending longer, modern text messages.

Step 2: Strip or Replace Unicode Characters in Your Code

The most immediate programmatic way to stop Unicode splits is to sanitize your message payload before sending it to your SMS gateway. You can write a utility function in your backend to strip out non-GSM-7 characters or replace them with their closest GSM-7 equivalents.

Here is how you can implement this in different programming languages using simple regex patterns and string replacement rules.

Python Implementation

In Python, you can use the unicodedata module to normalize your strings, stripping accents and converting smart quotes back to standard straight quotes:

import unicodedata
import re

def clean_for_gsm7(text):
    # Replace common smart quotes and dashes
    replacements = {
        u'\u201c': '"', u'\u201d': '"',
        u'\u2018': "'", u'\u2019': "'",
        u'\u2013': '-', u'\u2014': '-'
    }
    for unicode_char, gsm_char in replacements.items():
        text = text.replace(unicode_char, gsm_char)
    
    # Normalize and strip accents
    normalized = unicodedata.normalize('NFKD', text)
    ascii_text = normalized.encode('ascii', 'ignore').decode('utf-8')
    
    # Remove any remaining non-GSM-7 characters
    gsm7_regex = re.compile(r'[^\n\r a-zA-Z0-9^{}\\\[~\]|€$@!"#%&\'()*+,-./:;<=>?_]')
    cleaned_text = gsm7_regex.sub('', ascii_text)
    
    return cleaned_text

message = "Hello! Your appointment is scheduled for tomorrow at 3 PM. See you there! 😊"
print(clean_for_gsm7(message))
# Output: "Hello! Your appointment is scheduled for tomorrow at 3 PM. See you there! "

Node.js (JavaScript) Implementation

For JavaScript developers, you can use a similar approach using regular expressions to strip out any characters that do not conform to the GSM-7 standard:

function sanitizeToGSM7(text) {
    const smartReplacements = {
        '[\u201c\u201d]': '"',
        '[\u2018\u2019]': "'",
        '\u2013': '-',
        '\u2014': '-'
    };

    let cleaned = text;
    for (const [pattern, replacement] of Object.entries(smartReplacements)) {
        cleaned = cleaned.replace(new RegExp(pattern, 'g'), replacement);
    }

    // Remove accents
    cleaned = cleaned.normalize('NFD').replace(/[\u0300-\u036f]/g, '');

    // Keep only GSM-7 compatible characters
    const gsm7Pattern = /[^\n\r a-zA-Z0-9^{}\\\[~\]|€$@!"#%&\'()*+,-.\/:;<=>?_]/g;
    return cleaned.replace(gsm7Pattern, '');
}

const rawMessage = "Your order is ready for pickup! 🚗";
console.log(sanitizeToGSM7(rawMessage)); 
// Output: "Your order is ready for pickup! "

Step 3: Convert Smart Quotes and Accents to GSM-7 Equivalents

Oftentimes, Unicode characters slip into your messages via copy-paste actions from word processors like Microsoft Word or Google Docs. These processors automatically convert standard straight quotes (' and ") into curly "smart" quotes (‘, ’, “, ”).

To prevent your system from sending multiple SMS because of these minor changes, you can set up a character mapping table. This allows you to retain the readability of your text without triggering the 70-character UCS-2 limit.

• Convert ‘ and ’ to standard apostrophe '
• Convert “ and ” to standard quotation mark "
• Convert em-dashes (—) and en-dashes (―) to standard hyphens (-)
• Convert accented characters like é, á, í to their unaccented counterparts e, a, i

By mapping these characters explicitly, you preserve the professional appearance of your messages while strictly staying within the single-segment limit. This is particularly helpful for local service businesses like dental clinics, repair shops, and language schools that need to keep operational costs low while sending automated appointment updates.

Step 4: Switch to an SMS Gateway with Flat-Rate Segment Billing

While stripping Unicode characters is a functional workaround, it forces you to compromise on your brand's voice. In 2026, customers expect natural communication, which often includes emojis, localized accents, and professional formatting. Restricting your customer communications to basic ASCII characters just to avoid high telecom bills is no longer necessary.

Traditional cloud aggregators like Twilio, Plivo, and MessageBird enforce strict per-segment billing because they must pay carrier fees for every packet of data. Additionally, using these legacy platforms requires navigating complex A2P SMS registration, 10DLC carrier approvals, and monthly recurring fees.

An increasingly popular alternative is to use an Android-based SMS gateway like MySMSGate. MySMSGate turns your own Android phones and SIM cards into a fully functional SMS sending device. Because your messages are sent directly through your phone's SIM card (which typically includes unlimited or highly discounted local SMS bundles), you bypass traditional segment-based billing entirely.

MySMSGate charges a flat rate of $0.02 per SMS sent, regardless of whether your message contains Unicode characters, emojis, or spans multiple segments. There are no monthly subscriptions, no contracts, and no carrier registration delays. If a message fails to deliver, your balance is automatically refunded.

If you are looking for the best SMS API alternatives for bulk SMS comparison, reliability, and delivery rates, moving to an Android SMS gateway bypasses the entire Unicode billing problem at its source.

Step 5: Set Up Text Message from Multiple Phone Numbers Management

For local service businesses operating across multiple locations, managing messaging infrastructure can quickly become complicated. If you are managing multiple branches—such as five dental clinics or three auto repair shops—you need a system that supports text message from multiple phone numbers management from a single centralized interface.

With MySMSGate, you can connect an unlimited number of Android devices to a single account dashboard. This allows you to manage multiple numbers seamlessly:

1. Create your account: Register at MySMSGate to retrieve your API key.
2. Install the Android app: Download the MySMSGate companion app onto your Android devices.
3. Connect via QR Code: Scan the QR code displayed on your web dashboard using each phone's camera. This instantly links the devices to your central account without typing complex API keys.
4. Manage Dual SIMs: If your phones support Dual SIMs, you can choose exactly which SIM slot to send your messages from directly within your dashboard or API call.

This multi-device structure allows you to route outgoing notifications through localized numbers that your customers already recognize, significantly improving open and response rates. All incoming replies are automatically forwarded back to your web-based Web Conversations dashboard, enabling real-time, two-way chat directly from your computer.

Step 6: Send Your First Unicode-Safe SMS via REST API

If you are an indie developer, freelancer, or a technical business owner, integrating MySMSGate into your software is incredibly straightforward. The platform offers a clean, single-endpoint REST API that lets you trigger SMS notifications with minimal setup.

Here is an example of how to make a POST request to send an SMS using cURL. Notice that you can include emojis and special Unicode characters without worrying about segment cost inflation:

curl -X POST https://mysmsgate.net/api/v1/send \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "to": "+1234567890",
    "message": "Your vehicle is ready for pickup! 🚗 Please reply to this message if you have any questions.",
    "device_id": "your_device_id",
    "sim_slot": 1
  }'

For more detailed language implementations, you can explore the official MySMSGate API documentation, which includes production-ready code snippets for Python, Node.js, PHP, Go, and Ruby, alongside pre-built connectors for automation platforms like Zapier, Make.com, and n8n.

Frequently Asked Questions

Here are answers to the most common questions regarding Unicode SMS splitting, character limits, and billing structures.

Why does one emoji make my SMS send as multiple messages?

Standard text messages use GSM-7 encoding, allowing up to 160 characters per segment. Emojis are not part of the GSM-7 character set. When you add an emoji, the carrier must switch the entire message to UCS-2 (Unicode) encoding, which drops the segment limit to 70 characters. If your message is longer than 70 characters, it gets split into multiple segments, and traditional APIs charge you for each segment.

How can I check if my text contains Unicode before sending?

You can use online SMS length calculators or run a simple regex search in your code to detect non-GSM-7 characters. Alternatively, you can write validation scripts that flag or strip non-GSM-7 characters from your database before passing them to an outbound SMS queue.

Does MySMSGate charge extra for Unicode or multi-segment messages?

No. Unlike traditional APIs like Twilio or Vonage that bill per 160 or 70-character segment, MySMSGate charges a flat fee of $0.02 per message sent. Because the message is routed directly through your Android phone's SIM card, you do not pay per segment, allowing you to send emojis and long messages without worrying about hidden fees.

Do I need carrier or 10DLC registration to use an Android SMS gateway?

No. Because MySMSGate routes messages through your own physical Android phone and SIM card, your messages are sent as standard person-to-person (P2P) traffic. This means you do not need to undergo complex, expensive, and time-consuming A2P 10DLC registration or wait for carrier approvals.