LINE is the default messenger of Japan, Thailand and Taiwan — and a phone number is mandatory to create an account: the app confirms it with an SMS code at first launch. A virtual number from Get-SMS covers that step, which is handy if you're setting up LINE to talk to partners or customers in Asia without putting your personal number into the app.
LINE is noticeably pickier about number origin than Western messengers: it works best with numbers from its home region. On Get-SMS, LINE registrations run on the Thailand and Hong Kong pools — both are accepted reliably. Take a number from one of these countries, enter it in the app, and the code arrives within moments. If a specific number is rejected, cancel it free of charge and take the next one from the same pool.
Unlike most platforms, LINE ties the account region to the phone number's country: a Thai number produces a Thai-region account, which affects the sticker shop, some official accounts and promotions. For business communication this rarely matters — chats, calls and groups work identically worldwide. After registration, set a password and link an email in the app settings: LINE logs in by session and rarely re-asks for SMS, but the email is what saves the account if you change devices after the one-time number expires. One number registers one account — for a second LINE profile take a separate number.