uMobix has no free trial. There is a short refund window (a few days, and it is narrower than mSpy's), and the marketing pages that promise a "free demo" or "trial version" are affiliate funnels that end at a checkout. Treat any uMobix trial code as a reseller discount at best.
What the product actually does, so you can decide whether to pay: Android needs physical installation with the phone in hand; iPhone works from iCloud credentials, meaning backup-based, delayed, and dependent on 2FA not blocking you. Features: SMS, calls, contacts, social apps on Android, keystrokes on rooted or supervised Android, location, and a screen-recorder add-on at extra cost.
Where people get stuck: iPhone coverage is thinner than the marketing implies (no WhatsApp without a jailbreak), the refund window is short enough to miss, and the licence is per-device — a family of three phones costs three licences.
Honest comparison shopping: read the refund terms first, then check whether the device you need is Android (wide support, physical install) or iPhone (backup-only, limited). No vendor's free trial tells you that.
Where our app fits. Ultimate Phone Spy runs on Android 4.0+, Windows and macOS (supported devices) and covers SMS, calls, social notifications, app usage and location. We do not sell iPhone monitoring, and I would rather steer you to Apple's free Screen Time than to a backup-parsing subscription that disappoints.