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Last updated:
06.11.2026

Sending SMS

With SMS, you reach your contacts directly on their smartphone – quickly, concisely and independently of their e-mail inbox. In Oniva, you can use SMS in both campaigns and notifications.

Text message icon

Use cases

SMS are particularly suited to short, time-critical information – for example during the event, when your participants are on the move and hardly read e-mails.

  • Campaigns: Send an SMS to a selected target group, e.g. as a reminder shortly before the event starts.‍
  • Notifications: Use SMS as a channel for automatic notifications.

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Requirements

Activating SMS

Sending SMS is deactivated by default. To use SMS, please contact our support team – we will activate the feature for you.

Adding a phone number

An SMS can only be sent to contacts who have a mobile number saved. The number is validated based on the country code. The following countries are currently supported:

Country Country code/th>
Switzerland+41
Germany+49
France+33
Denmark+45
Netherlands+31
Sweden+46
Poland+48
Latvia+371
Estonia+372
Lithuania+370
Portugal+351
Switzerland
Country code/span>+41
Germany
Country code/span>+49
France
Country code/span>+33
Denmark
Country code/span>+45
Netherlands
Country code/span>+31
Sweden
Country code/span>+46
Poland
Country code/span>+48
Latvia
Country code/span>+371
Estonia
Country code/span>+372
Lithuania
Country code/span>+370
Portugal
Country code/span>+351

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If no country code is given for a number, +41 (Switzerland) is assumed automatically. Make sure you always enter foreign numbers with their country code.

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Content and character length

SMS consist of plain text. Variables (e.g. first name or event name) and formatting are not supported – all recipients receive the same text.

How many characters fit into an SMS depends on the characters used:

Character set Examples Characters per SMS
GSM-7 (standard characters)Letters, digits, common punctuation marks160
UnicodeEmojis, certain special characters70
GSM-7 (standard characters)
ExamplesLetters, digits, common punctuation marks
Characters160 per SMS
Unicode
ExamplesEmojis, certain special characters
Characters70 per SMS

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If your message is longer, it is split into several SMS (segments) and reassembled on receipt. Even a single emoji or special character causes the entire message to be sent as Unicode.

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Sender and billing

Sender

"Oniva" is currently displayed as the sender. It is not yet possible to set your own sender name.

Billing

Billing is based on the SMS actually sent. If a message is split into several segments because of its length, it counts as two or more SMS. Example: a message with 200 standard characters is billed as 2 SMS per recipient.

You can find the current SMS prices on our pricing page.

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Frequently asked questions

Everything you need to know about this topic.
Why was my SMS counted as multiple messages?

The message has exceeded the maximum character limit for an SMS – 160 standard characters or 70 characters if emojis or special characters are included.

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Can I personalise the SMS message?

No, SMS does not support variables. All recipients receive the exact same text.

Why is a contact not receiving SMS messages?

Check whether a mobile number has been provided and if its area code belongs to a supported country. If the area code is missing, +41 is assumed – for international numbers, this will result in an incorrect number.

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