When it comes to sending international SMS with Lyca mobile, Lycamobile works in the same way as other cells. Simply dial the number you need: 011 followed by your country code, then your area code and then the phone number and press the send sms button.
For example, if you want to send SMS to a mobile in India then you would dial: 01191(Followed by India mobile number)
Please note that most premium text services in other countries cannot be reached from a cell phone service when calling from outside that country.
Source: http://www.lycamobile.us/en/faq