If you are coming from USA to Sri Lanka for a visit, if you are looking for calling facility, you may use your Smartphone.
But losing it may give you much trouble. So buy a cellphone from near by shop for around US$ 25.
Provide your passport photo copy and buy two Pre-Paid SIM cards from them with two different mobile numbers. Then re-load them for US$ 10 each. Ask them to activate them and check it your self whether they are functioning properly in your phone.
Now with one SIM in the cellphone and one SIM in hand start your preparation work.
Save all your important contacts in the SIM and phone book of the phone too.
Now remove the SIM and insert the new SIM and store all those important contacts to this New SIM card.
Keep the other SIM card in a safe place as this will save you from putting insurance coverage for it.
Now send SMS message for all your contact that this is your Sri Lanka number for them to contact you if they need.
If you lost your cellphone no problem get a new phone and insert your other SIM.
You have all your contacts here.
This is more cheaper than depending on a cellphone insurance plan where it used to cost you $10 a month.
By the way, inform to the carrier about the lose of the SIM card and you can get a new one with the same number and with your remaining balance. For this SIM card the cost is used to be around $1 only. The SIM card with the lost cell phone will be disabled.
If you happened to get the cellphone again no problem throw away the SIM that is inside of it as it it won’t work any more.
If you want to make the phone too to be unusable you must complaint the incident to the nearest police with the IMEI number and send the complaint copy to the Sri Lanka TRC and they may disable the the device in short period.