Answer
No, you cannot rely on an oral termination. Terminating a lease in Uruguay requires a written process: without a written contract or agreement, it is impossible to properly document the termination of a residential lease.
Obligations when moving out are determined by the lease agreement, the guarantee, and the parties’ agreement. If you simply move out and hand over the keys without written confirmation, payments and liability may remain the tenant’s responsibility.
Before moving out, you need to agree on the date, the condition of the property, meter readings, the return of the keys, and the termination of the guarantee. The outcome should be documentary evidence, not a message in a chat or an oral “everything is fine” after an inspection. Otherwise, a dispute may arise after you have moved out and locked up the apartment.