I also have recevied three text messages on this and the North Island Credit Union  advises forwarding the message to abuse@myisland.com and then to also notify your cell phone user. The message comes from service@webmyisland.com
Message goes:  Subject:NOTICE Your North Island Credit Union bill service is expired, for renewal please call us toll-free 814.433.1017 ASAP

I just got a text from this number saying the same thing about bill service being expired. I am also a member of NIFCU. I didn't call it back.

Didn't actually get a call from it - and be aware that a month from now it might be somebody's legit number - they move on to new #s in as little as a day... It was the callback number today in a phishing scam text [Email addy] message from Sprint "service@webmyisland.com" claiming your "bill service is expired and needs to be renewed ASAP". I didnt call the number because they would capture my number for future nefarious purposes, and its long distance from a pay phone. Think I'll try getting a spoof card or similar so I can call back and learn more - Sprint Tech support and eCare just *blow you off* with the comment that you can block up to 50 text-senders - that doesnt help when each time its a slightly different sender addy or number, and at first glance,  its a pretty slick trick - I happen to have an acct at NIFCU, for example.