Permanent, safe, free (most carriers), no software risk. Cons: Requires eligibility; can take days; not possible if phone is blacklisted.
I can try to provide some information on the Tecno TR118 and unlocking it.
The dusty plains of the Sahel didn't care for technology, but Elias did. He sat in his small corrugated-metal shop, the heat radiating off the roof like a physical weight. On his workbench sat a Tecno TR118