First you must have that person's correct phone number.
There are six kinds of phone services available in Sri Lanka.
Srilanka code is 0094 or +94.
First dial the Lanka country code 0094 or +94
Then dial the Colombo area code 11 followed desired person's number 212***2
So this is the number you had dialed 009411212***2
If the person picks the phone you can talk with him.
If you want to call a land line number in Jaffna town from UK, then dial 009421 followed by the customer's phone number.
Current Local Time in Sri Lanka
Check Sri Lanka public holidays for 2019 here
Dial the Sri Lanka phone code 0094 or +94
Then dial the mobile phone number with out the front 0 (which you used to dial in Sri Lanka while you are staying there.)
0094775****06 the phone will ring and the owner can talk with you.
Mobile phones and CDMA can send and receive SMS text messages.
0112xxxxxx. Use 0 and 112 Colombo Code before the Colombo number.
You have collect call facility when you are calling a Sri Lanka landline from overseas.
If the phone owner accepts the call the tariff of the call will be included in his monthly bill.
Current Sri Lanka local time GMT +5.30
Public holidays, Sundays and Poya days are the best time to make low priced calls to any part of the world from Sri Lanka through out the day and night.
International country code of Sri Lanka is +94 or 0094.