Answer:
I'd say the sentence is more to the formal side. This is because it isn't a causal, "Hey there, would you want a guarantee for your new phone?", or a, "Yo, dude, want a guarantee for your new phone?" This sentence is what you'd say respectfully to a stranger you might not know. Hope this helps! Please mark as Brainliest if you could, that would be appreciated. :)
