Not a specific device, but usage. In early-mid 2000s in Ukraine, most (if not all) cell phone services were prepaid, and special SMS or codes allowed you to sen

Not a specific device, but usage. In early-mid 2000s in Ukraine, most (if not all) cell phone services were prepaid, and special SMS or codes allowed you to send some amount of money from your account to someone else. Since not many people had actual banking accounts, this was a de-facto banking system at the time. I believe this or similar systems are still in use in some countries.