You can save contacts to your phone contact list and send message / mails to multiple contacts.
If you have an xls / csv file as your contact list then please keep the following constraints in to your consideration before importing it to the app :
1. The first column in csv / xls file will be shown in contact list. Whichever column you want the app to show as list items, keep it as your 1st column.
2. Multiple numbers / emails in one column can be separated with "&".
3. Each "," in content of a CSV file will be considered as a new column.
4. Content in 1st two column will be displayed as part of list item in contact list.
5. If a row has content only in 1st column, then that will be considered as a title (non selectable item) of list.