Twilio is not available for some regions anymore so I offer you guys with other website. You can get overseas phone number and receive SMS worldwide. How to use it? When needing to key in overseas phone number, you just choose one from the website to type in. After that, click on the number you just selected to receive SMS. The best thing is that this service is for free!
Website with phone numbers of Ireland
Click here to Receive SMS Online.
*2014/6/26： Some of the numbers are no longer available for some services (for example, registering phone number on LINE.). If it happens to you, please try other numbers on the website.
When I find other ways to get phone numbers of this region, I will update in this article.