By default, every SimpleTexting account is set up with a toll-free number.
Depending on your use case, you may want to switch to a local number or a dedicated short code. If you do, any messages you've already sent will be safely transferred along with your contacts.
However, if you switch from a toll-free or local number to a short code, you may lose some or all of your keywords.
Dedicated short codes are leased 6-digit numbers that are easy for your subscribers and recipients to remember.