The Roamless deal is generally the better one however this one from Heinemann (Duty Free Shop) works for 100 countries instead of 51. Also No app needed, just scan the QR on the page. No payment details needed.
Countries that the Heinemann eSim covers that Roamless doesn't:
Algeria, Argentina, Armenia, Austria, Brazil, Bulgaria, Cambodia, Canada, Chile, China, Colombia, Costa Rica, Cuba, Cyprus, Dominican Republic, Ecuador, Egypt, El Salvador, Georgia, Gibraltar, Guatemala, Guernsey, Iceland, Indonesia, Ireland, Italy, Jamaica, Jersey, Jordan, Kazakhstan, Luxembourg, Macau, Mexico, Monaco, Morocco, Oman, Panama, Paraguay, Peru, Poland, Qatar, Romania, Russia, Serbia, Slovakia, South Sudan, St. Barthelemy (Island), St. Martin, Sudan, Sweden, Tanzania, Thailand, Ukraine, United Arab Emirates, Uruguay, Vatican City (Holy See).
and here is the entire list:
Albania, Algeria, Argentina, Armenia, Australia, Austria, Bangladesh, Belgium, Brazil, Bulgaria, Cambodia, Canada, Chile, China, Colombia, Costa Rica, Croatia, Cuba, Denmark, Dominican Republic, Ecuador, Egypt, El Salvador, Estonia, Finland, France, French Guiana, Georgia, Germany, Gibraltar, Greece, Guadeloupe, Guatemala, Guernsey, Hong Kong, India, Indonesia, Ireland, Iceland, Israel, Italy, Jamaica, Japan, Jersey, Jordan, Kazakhstan, Kuwait, Latvia, Liechtenstein, Lithuania, Luxembourg, Macau, Malaysia, Malta, Martinique, Mayotte, Mexico, Monaco, Morocco, Netherlands, New Zealand, Norway, Oman, Pakistan, Panama, Paraguay, Peru, Philippines, Poland, Portugal, Qatar, Romania, Russia, Saudi Arabia, Serbia, Singapore, Slovakia, Slovenia, Spain, Sweden, Switzerland, St. Barthelemy (Island), St. Martin, South Africa, Sudan, South Korea, South Sudan, Taiwan, Tanzania, Thailand, Czech Republic, Tunisia, Turkey, Ukraine, Hungary, Uruguay, Vatican City (Holy See), United Arab Emirates, United States, United Kingdom, Vietnam and Cyprus.
Have given it a try and seems to work fine but not sure what network it's using.
via MyDealz
3 days expiry.