No, Tick Box's (or Accept Buttons) is for the Online Applications, Forms are for Face to Face Contracts, ie, Shops, but I don't think most Networks still do the Forms anymore, more are of a Agree to it, possible look at the T&Cs then its back to a possible Tick Box on the Shops Screen.
Telephone Sales, ie, Customer Care rely on "Customer agreed to T&Cs Evidence" which is covered under "All Calls are Recorded" and therefore can be proved, apart from all this, most Networks can fall back on their Terms of Service Policy which buried in there will be something like, "By using our Service you are agreeing and accepting our Terms and Conditions" which was the big Rug Puller to move away from having to Sign Paper Work like you needed to years ago. 😉
