> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.theconvertway.com/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# SMS Sender ID FAQs

# SMS Sender ID FAQs


**1. What is a Sender ID?**

Sender ID is the name or number which appears on the mobile phone as the sender of a SMS (It is used to identify who’s sending the message to the recipient).
 Sender ID can be an alpha character, alpha-numeric name such as the name of your company. You can enter Sender ID for approval, once approved all your SMS notifications will be sent with approved sender id for you.

**Sender IDs are classified as one of two types.**
* Dynamic Sender Ids
* Preregistered sender IDs



**2. What's the difference between dynamic sender ID and preregistered sender ID?**

Customers can start sending messages with custom sender IDs immediately in countries that support dynamic sender ID
Pre-registered Sender IDs must be approved before you can use them to start sending them under your brand name. 


**3. Which countries support dynamic sender ID and Which countries require a preregistered sender ID?**

[Here](https://shipwayconvert.crisp.help/en/article/country-specific-requirements-for-sms-sender-id-registration-1mo7ztm/?bust=1651133569287) is the complete list of countries which have dynamic sender Ids & which need Pre-registered Sender Ids

Along with basic information about the company, preregistration requires document submission.  [Click here](https://shipwayconvert.crisp.help/en/article/country-wise-sender-id-preregistration-chart-eta-work-days-bmgsks/?bust=1651133569283) for a list of countries with  time details required for preregistration.

**4. Are there any restrictions on selecting a sender ID?**

* Enter a minimum of six characters that represent your brand identity. You can include upper- and lower-case letters, the numbers 0 - 9, and spaces.
* Include at least one letter.
* Do not use ASCII special characters (such as # or @).
* For India, the sender ID must be exactly six characters.