When sending a message using a numeric Originator (such as a mobile number), please ensure that a plus (+) is prefixed to the number prior to sending. This will ensure that the message arrives correctly to the handset and that the recipient is able to reply.
For alphanumeric Originators, any character within the standard GSM character set is allowed. While we do allow these characters, please note that for certain characters some Network Providers and/or SMSCs do not always display these characters correctly. We recommend only using standard A-Z characters (upper- and lower case) and numbers.The ampersand (&), hash (#) and exclamation sign (!) are permitted as well. In addition, please ensure that the length of the Originator is no longer than 11 characters.
NOTE : Replies are not possible to messages with Alpha-numeric Sender Ids
When sending a message containing a shortcode as Originator, ensure that no plus signs are added and that the length of the shortcode is only 5 characters
If a dedicated long number has recently been assigned to the account, ensure that half an hour has passed before any message send is attempted. The internal memory of the DMSP takes half an hour to refresh all numbers that belongs to messaging accounts and as such won't have any records of a new number being assigned to an account until this time period has elapsed. Once the internal memory has been refreshed the account will be able to fully utilise the number
Originator values accepted by SMPP providers are either:
Numeric 5 - 15 characters (with + to indicate international format MSISDN making 16 chars max)
Alpha Numeric 3 - 11 characters
Recommended alpha numeric characters are: a - z, A - Z, 0 - 9, " " (space), ".", "_", "-", "!", "&", "#"
For additional characters, please see our article on the GSM character set. Please note that only characters within this character set is supported.