SMS from TeamPlusnet - Dodgy or Legitimate?

[#1]

Just received the following text message...

Hi Duncan, it's our 1st Birthday! As a thanks for being with us, you're in our big giveaway to win a great prize. T&Cs goo.gl/re8k4d Opt out: goo.gl/HR83TT

Does anybody know whether this is a real plusnet message or just someone spamming dodgy links?

Thanks in advance.
Duncan.

[#2]

Hi Daddadook!

Don't worry - this message is indeed legitimate!

We're celebrating our First Birthday here at Plusnet Mobile, and we've entered all customers (who've opted to receive marketing) into a free draw to win some fantastic prizes!

[#3]

That's lovely then. Thank you.
A very nice idea.

[#4]

You're very welcome Daddadook, we're glad you like it! 

Good luck, I've got my fingers crossed for you