Group messaging is used when you need to group your contacts. Contacts are then imported from excel, always remember to put the phone numbers on the second column or B column in the excel sheet. The other columns can contain names and other relevant information. With group messaging, contacts are saved in your account. WHILE
Excel messaging notification allows users to include more than just the names of the individuals in the message, but also include any information that is unique to the group of users. Excel messaging features include names, position, date of birth, amount if any etc. You can include the names of your contacts in the excel spreadsheet into your message. If you want to insert the content of a column in your excel spreadsheet into your message, enter the column number enclosed in square bracket . E.g. Third column , Fifth column  where you want the information to be.
Remember to put the phone numbers in the first column or A column.