SMSCodesOI is a decent temporary tool if you need a quick SMS code and understand the privacy risks. For anything important, use a real phone number or a paid, private virtual number service.
Despite causing suspicion, most occurrences of smscodesoi are completely legitimate. You will typically encounter this sender ID when:
Choose the specific app you want to verify (e.g., Telegram, Uber, Airbnb) and the country for the phone number.