Will upgrading to unlimited increase my minimum contract length?

[#1]

I'm currently on a 15GB usage product @ £14.65 a month with 1 month's notice... if I go to the unlimited product will I be starting on a fresh contract with 1 year's notice?
Thanks

[#2]

if you don't take the router and free house move it's 12 months, otherwise it will be 18

[#3]

Hiya,
Like Adie says, if you were to move onto Unlimited, it would initiate a 12 month contract.
Let us know if you need any help at all.