Short answer：No one can guarantee which devices every home will use in 2030. Focus on maintainability, handover and fallback instead of unsupported adoption forecasts.
Check long-term conditions
Review updates, parts, subscriptions and export and test changes of phone, network or supplier. Verify compatibility with actual models rather than logos.
Keep household control
Retain basic manual operation and support so essential functions do not depend entirely on one account. Manage access, recordings and activity data and revoke old permissions during handover.
Before deciding
- Compare lifecycle rather than purchase cost
- Test outage and service-closure scenarios
- Ensure users understand basic operation
Sources and method
Sources support the specific rules described. Checklists and hypothetical calculations are editorial explanations, not measured market results or individual approvals.
Revision：Removed unsupported experience, case outcomes and statistics; corrected the topic-specific rules and limitations described above.
Scope：General information only, not personalised legal, tax, immigration, admissions or investment advice.