I have used many Prepaid sim cards over the years. I have stopped using them because I was losing to much money when they went out of business. I use Three UK sim now and it covers a-lot of countries. The money never expires. You can get 10gb of data for 30 days, and I might be wrong but unlimited minutes for 30 days in their roaming countries. I have used it all over Europe, UAE, and Africa. I have had it for at least 10 years. If I am in a country for two weeks or more I get a local sim card. I hope this helps.