When it comes to making international calls, Lycamobile works in the same way as other cells or fixed line phones. Simply dial the number you need: 011 followed by your country code, then your area code and then the phone number and press the call button.
For example, if you want to call a mobile in India then you would dial: 01191(Followed by India mobile number)
If you want to call a landline number in India then you would dial: 01191(Area code without zero in the beginning)(Followed by landline number)
Please note that most premium voice and 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