A sub keyword is a word used in addition to a keyword that is owned and predefined by us. We own the keywords “to”, “set”, “mail”, “go”, “start”, “win” and “poll” on the Dutch short code 1008. For example, instead of reserving the keyword 'BIRD' for your target audience, you can choose to use 'BIRD' as a sub keyword in combination with our keyword 'START'.
The main benefit is that a sub keyword is even cheaper than a keyword. A great solution whenever you wish to use multiple variations. An example: you would like your customers to either start a service that is called bird, or another that is called message. By reserving the sub keywords 'BIRD' and 'MESSAGE' you'll be able to let your customer opt for either one by texting 'START BIRD' or 'START MESSAGE'.
If you are looking to use 1 keyword but want to differentiate further underneath them, this is possible via the API. So if you were to have a voting contest for example called BIRDQUIZ, and want people to be able to vote easily for their suspected answer, by having them text ‘BIRDQUIZ 1’, ‘BIRDQUIZ 2’, BIRDQUIZ 3’, etc, you could build something via the API to allow your system to recognise the different votes separately due to the virtual ‘sub keywords’ (in this case the numbers) and have the API act differently depending on what people send in. So if the correct answer is ‘BIRDQUIZ 2’, when this is received the API sends a message back saying ‘You guessed it right!’.