Use following steps to send schedule SMS:
1) Login in our SMS portal, For Login Process visit here.
2) Inside login left side top corner you can get route names (Like Trial, Promo, Transactional, PromoID) click on that.
3) After clicking route name you can get the dropdown list of all routes so you can check your balance in front of your purchased SMS service route.
You can refer the below screenshot of SMS portal and check the balance.