Ans: Keyword: Each incoming sms at shortcode is routed on basis of first word of sms. This word is called Keyword. Which identify that who should read this sms. The concept of keyword is mainly useful for shared shortcode. For example your company name is ABC pvt. Ltd. So you can buy ABC keyword on any shared shortcode supposes on 56677. Your user needs to type "ABC message" and send it to 56677. In this way that message will be redirected to your inbox because the first word of the sms (ABC) is owned by you. Sender will immediately receive the auto reply.

Subkeyword: A subkeyword is the word which is immediately followed by the main keyword.A subkeyword can be used as a main keyword.Suppose you own a college named ABC institute now there are 3 different courses available in collage say MBA, MCA BBA. In that case in order to generate inquiries for these 3 courses you don’t need to buy 3 different keywords you can buy a single keyword ABC and create 3 subkeywords i.e. ABC MBA, ABC MCA, ABC BBA, in order to receive inquiries for 3 different courses and you can even set 3 different auto replies for all 3 subkeywords.

Ans: You can create unlimited subkeywords with your main keyword and that will be totally free of cost.