30 days of validity is not a monthly subscription.
A 30-day travel eSIM is a prepaid package with a validity window. It does not mean the plan automatically bills you again next month. Check the activation rule before travel, because the validity may begin on the first supported network connection rather than at purchase.

Aland Islands
Albania
Algeria
Armenia
Australia
Austria
Bangladesh
Belarus
Belgium
Bulgaria
Cambodia
China mainland
Croatia
Cyprus
Czech Republic
Denmark
Estonia
Faroe Islands
Finland
France
French Guiana
Georgia
Germany
Ghana
Gibraltar
Greece
Guadeloupe
Hong Kong (China)
Hungary
Iceland
India
Indonesia
Ireland
Isle of Man
Israel
Italy
Japan
Jersey
Kazakhstan
Kyrgyzstan
Latvia
Liechtenstein
Lithuania
Luxembourg
Macao (China)
Malaysia
Malta
Martinique
Mayotte
Moldova
Montenegro
Morocco
Netherlands
New Zealand
North Macedonia
Norway
Pakistan
Philippines
Poland
Portugal
Reunion
Romania
Russia
Saint Barthelemy
Saint Martin
San Marino
Serbia
Singapore
Slovakia
Slovenia
South Africa
South Korea
Spain
Sri Lanka
Sweden
Switzerland
Thailand
Tunisia
Turkey
Ukraine
United Kingdom
United States
Uzbekistan
Vatican City
Vietnam
Canada
Egypt
Bahrain
Brazil
Iraq
Kuwait
Laos
Afghanistan
Bosnia and Herzegovina
Oman
Qatar
Azerbaijan
Fiji
Jordan
Mexico
Puerto Rico
Saudi Arabia
Argentina
Chile
Dominican Republic
Honduras
Kenya
Mauritius
Nicaragua
Paraguay
Peru
United Arab Emirates
Ecuador
Guatemala
Nauru
Nepal
Tajikistan
Zimbabwe
Andorra
Senegal
Colombia
Bhutan
Guam
Uruguay
Costa Rica
Guernsey
El Salvador
Mongolia
Nigeria
Papua New Guinea
Samoa
Tonga
Vanuatu
Democratic Republic of the Congo
Seychelles
Tanzania
Brunei Darussalam