SMS Credits & Billing
The SMS add-on includes 300 message segments per month for $15/month. Credits are tracked automatically and refill on your billing cycle.
What Counts as a Segment
A single SMS message can use one or more segments depending on its length and character type:
| Message Type | Characters Per Segment | Example |
|---|---|---|
| Standard text (GSM-7 encoding) | Up to 160 characters | English text with basic punctuation |
| Unicode text (UCS-2 encoding) | Up to 70 characters | Messages with emojis or non-Latin characters |
If a message exceeds one segment, it is split into multiple segments. For example, a 200-character standard text message uses 2 segments.
Most notification messages sent by Service Invoice Pro are short and fit within a single segment.
Checking Your Balance
Go to Settings → SMS Notifications. The credits widget at the top shows:
- Remaining — how many segments you have left this cycle
- Monthly — your total monthly allocation (300)
- Next Refill — the date your credits reset
The widget turns amber when credits drop below 50 and red when credits reach 0.
When Credits Refill
Credits automatically refill to 300 on your monthly billing date when your SMS subscription renews. Unused credits do not roll over to the next month.
When Credits Run Out
If your credit balance reaches 0, SMS sending stops until your next billing cycle. Existing toggles and settings remain in place — texts will resume automatically when credits refill.
Related
- SMS Notifications Overview — what the add-on includes
- Enabling SMS — how to activate the add-on
- Billing & Plans — manage your subscription