Two kinds of message, and they are separate decisions
Nothing is pre-ticked. Turning on neither is a normal choice and this page works the same either way.
Study matches
A text when something opens that fits the answers you gave. This is the one most people want, because it is the reason they filled anything in.
How research works
Occasional plain-language pieces on how trials are designed, what consent actually commits you to, and what happens at a screening visit. These go out rarely and nothing depends on reading them.
Never pre-ticked
Every box on every form here starts empty; we have no mechanism for a pre-ticked one. STOP cancels, HELP explains. Nobody buys your number from us because we do not sell it.
Set your preferences
A mobile number is required here, because the whole page is about text messages.
Saved.
If you turned a box on you will get one confirmation message and nothing else until there is something to say.