Sri Lanka SIM Cards.
Sri Lanka SIM cards are available under contract to citizens of Sri Lanka and foreigners who are more than the age of 18 years. Normally Smartphones and mobile phones used to have one or two slots for SIM (Subscriber identity module) cards for each mobile number they are registered for. Sri Lanka mobile phone carriers are allowed to provide only 5 SIM cards under contract for a person to use for their personal use.
Mobile phone user can visit the nearby service provider and can obtain a SIM card by signing the contract and providing her/his NIC photocopy and can select one of his phone number out of the provided 10 phone numbers. Also can set his calling plan as post paid or pre-paid and can activate the service then and there. Normally it will be active within one hour of time. Foreigners are requested to provide their passport and a copy of it to purchase a SIM card under their name, during their short stay in Sri Lanka.
The SIM card popularly used in Sri Lanka is standard sized one that is called as full size Sim card which can hold up to 250 contacts names and their phone numbers in it.
Types of SIM cards currently used worldwide in the year 2015 Full-size SIM
Embedded-SIM / Embedded Universal Integrated Circuit Card (eUICC).
Most of the SIM cards are coming as standard one while you can press through the center part and get the mini SIM to use in Smartphone. If you are going to use a latest Smartphone that will accept Mini-SIM, Micro-SIM or Nano-SIM then contact the mobile service providing center and ask them to provide a new SIM for it by providing your current SIM card. If the required SIM card is available, they will provide one. Otherwise they will cut it according to the size and provide it to you. Before leaving the place insert it and check whether it is working perfectly. Take note, once it is cut you can't use it in your normal cellular phone as it won't fit there. But by placing it in the older cover will allow to work in simple cellular phones.
You can produce your worn out or battery draining SIM card to your service provider and pay the required money and can be replaced with a new SIM card along with your mobile phone number. If you are going to change your SIM card with a replace one, backup your contact details and SMS text messages.
If you are going to take your SIM with you while you are going on a foreign trip, then inform your carrier and ask them to work it in the roaming mode while you are over there.