Key takeaways
- An alphanumeric sender ID shows a name such as your brand, but people usually cannot reply to it.
- A long number is a normal phone number and can receive replies.
- A short code is a very short number, used mainly for high-volume messaging in some countries.
- Rules, registration and availability differ by country, so check each destination.
The three kinds of sender
| Type | What the recipient sees | Replies | Typical use |
|---|---|---|---|
| Alphanumeric sender ID | A name of up to 11 characters, for example your brand | Usually not possible | One-way notifications, one-time codes, alerts |
| Long number (virtual number) | A full phone number | Yes | Two-way conversations, support, replies and keywords |
| Short code | A very short number | Yes, where supported | High-volume programmes in countries that use them |
Why a name builds trust
A recipient who sees your brand name knows who is writing before opening the message. That helps with one-time codes and alerts, where people need to recognise the sender at a glance.
A name also makes it easier to spot a fake: if your messages always come from the same name, a message from a look-alike stands out. Protection against spoofing is covered in our guide on sender protection.
Registration and country rules
Some countries let you send with any name, some require the name to be registered in advance, and some replace an unregistered name with a generic number. Some do not accept alphanumeric senders at all for certain message types.
Plan the registration early: it can take time, and the rules change. Our guide to the registration process lists what is usually needed.
How to choose
- One-way alerts and codes where brand recognition matters: an alphanumeric sender ID, where the country allows it
- Conversations where people reply: a long number, or a short code where it is used
- Many countries at once: expect a mix, and let your provider tell you what applies per destination
- Marketing and transactional traffic: consider separate senders, so one cannot affect the other
How ZafeConnect fits
ZafeConnect supports local SenderID registration and local regulatory handling in the countries it serves, and offers SenderID, phone numbers and two-way messaging as products. Tell us your destinations and we will confirm what applies in each.