CertFun runs in a web browser, and a current mobile or tablet browser counts — there is no separate app to download from a store. Point the browser at the site, sign in, and a sitting plays out just as it would on a laptop. The one practical requirement is a steady connection, since each question is served over the network as you move through the exam.
In other words, the device matters less than the browser and the connection. A phone, a tablet, and a laptop all reach the same simulation the same way; what changes is screen size and how comfortable a long sitting feels.
Running a Certification Exam in a Phone or Tablet Browser
Because the whole thing is a web page, any up-to-date browser on a phone or tablet will open it — no install, no app-store step, the same login as on a computer. Glancing back over a TIBCO mapper question on a tablet between meetings, or running a mini sitting on a phone while you are away from your desk, is perfectly workable. A small screen is simply less roomy for a full-length paper, where the extra space of a laptop makes reading long scenario stems and comparing options easier, so a natural split is to keep the short sittings for mobile and the full-length ones for a bigger screen.
What a Certification Exam Sitting on Mobile Needs
Since the sitting is live over the network, the main thing to guard against is losing the connection mid-question: a dropout, or a switch between wifi and cellular partway through, is what can interrupt an attempt, so a stable link keeps the timer and your answers moving together. Signing in on a phone follows the same single-active-session rule as everywhere else — one live login at a time — which is covered on its own page. Beyond that there is nothing device-specific to set up: open the browser, sign in, and start.