Here is a guide to understand the math behind the calculations shown on the message composer
DENOMINATOR IN OUR CALCULATIONS:
| Max Character Length Per Segment | |
| Text message | 160 characters |
| Text message with emoji | 70 characters |
| Text message with image | 1600 characters |
| Text message with image and emoji | 1000 characters |
NUMERATOR IN OUR CALCULATIONS:
The numerator in our calculations = company short name + characters you type in the message composer + URL
EXAMPLE MESSAGE:
There are 192 characters in this message. Here is how we calculated it:
- Company short name = MercerMain:
- 12 characters with the space at the end
- Characters you type in the message composer = Great! If you are most interested in receiving discounts and news from Celebs: reply 1, Athletes, reply: 2, Musicians, reply: 3, YouTubers, reply: 4
- 149 characters with the space at the end
- URL: https://mercer.vyg.mobi/2aafef1
- 31 characters
Since this is a text message with no image or emojis, 160 characters is the limit per segment. Thus this message would cost 2 segments
When using dynamic variables (example: ), keep in mind that we can't guarantee specific character counts. The actual number of segments you will be billed for will be greater than or less than the preview number displayed
What is the History Behind SMS Message Length?
SMS is a standardized communication protocol that enables devices to exchange short text messages and was defined as part of the 1985 GSM protocol. Voyage doesn't control these rules. Originally it was designed to "fit in between" existing signaling protocols which is why SMS length is limited to 160 seven-bit characters. It was subsequently codified into the SMPP signalling protocol that transmits SMS and is limited to precisely 140 bytes (or 1120 bits).