Yes, with screen size limitation. If your phone or small tablet has a screen under 10.1 inches, the mobile apps are free forever for basic editing.
No. They are either:
Verdict: High Risk, Low Reward. Searching for free activation keys for premium office suites on mobile is generally a futile and potentially dangerous endeavor. While the allure of unlocking premium features for apps like OfficeSuite, Polaris, or the Microsoft 365 app is strong, the reality is that "free keys" found online are almost exclusively scams, malware vectors, or piracy. office suite mobile activation key free
Here is a detailed breakdown of why this search term usually leads to a dead end. Yes, with screen size limitation