A top-up recharge is the process of adding balance to a prepaid mobile phone number. This balance can be used to make calls, send text messages, access the internet, and other services depending on the subscription the user has with their telecom provider. The terms "top-up" and "recharge" are often used interchangeably, but they can have different meanings in different countries. In general, a top-up is a way to replenish a prepaid mobile account without extending the validity period, while a recharge is a way to replenish a prepaid mobile account and extend the validity period. However, in recent years, the validity defined by service providers is considered lifetime validity, so the terms are now used in the same context to add balance to the account without worrying about the validity period. Users can send a top-up to their own phone number or recharge someone elses number by providing the recipients mobile number, country, and operator. Top-up recharges can be done online through various websites that offer the service.