When your web application needs to send and/or receive SMS messages cost-efficiently, FromSMS is the solution for you. FromSMS offers a simple HTTPS POST interface for sending of SMS messages - all you need is a Symbian (S60, ^3, Anna, Belle) device with free FromSMS Client installed.
Using FromSMS you avoid issues related to SMS roaming - you select
SIM card and operator you want to use for sending and receiving SMS
To keep you in control of costs, you can restrict number of sent SMS
messages in FromSMS Client. It also allows you to set blacklist and
whitelist for recipient numbers. To decrease data costs, FromSMS Client
can use WLAN connection to FromSMS Server.