The trial is Apple's to give: Apple decides whether your Apple Account is offered one, and it starts the moment you sign up for Pro through the App Store.
What happens when the trial ends
When the 7-day trial ends, Soco Pro turns into a paid monthly subscription billed by Apple, unless you cancelled first.
Cancel at least 24 hours before the trial ends, or Apple charges you for the first month.
Cancel during the free trial
To cancel Soco Pro during the trial:
Open the Soco app.
Tap the account icon in the top right.
Under Help, tap Manage subscription. Your Apple subscription settings open.
Follow Apple's prompts to cancel Soco.
Apple's subscription screen then shows Soco as expiring on a date instead of renewing. You keep Pro until that date and aren't charged. If you can't open the app, Apple's own guide covers cancelling from your Apple Account: If you want to cancel a subscription from Apple.
If the app offered a trial you didn't get
If a screen in the app offered you a free trial and you were charged instead, or showed a trial longer than 7 days, send us a screenshot in the app chat. Your screen is the evidence, and we'll check it and put it right rather than tell you it wasn't there.
Next steps
Your next question is probably one of these: