The answer depends on your hardware and your budget.
The "universal modem unlocker top" of tomorrow faces a fierce enemy: roaming locks. Newer 5G modems (Snapdragon X65/X70) store lock information not just in the modem firmware but also in the UEFI Secure Boot partition. universal modem unlocker top
For older modems (often called "Old Algo"), you don't even need software. You just need a web-based calculator that takes your modem's 15-digit IMEI number and generates an unlock code. The answer depends on your hardware and your budget
Before we crown the "top" contender, we must understand the technology. A modem unlocker is a piece of software (or an algorithm) designed to remove the carrier lock from a cellular modem. universal modem unlocker top