Google will make a major change next week to its two-step verification (2SV) policy that will eliminate an older method that left users at risk. The previous method sent one-time codes via short messaging service (SMS), which was reported by the National Institute of Standards and Technology (NIST) as being fundamentally insecure. The new 2SV procedure will prevent malicious actors from hijacking phone sessions to gain SMS codes. Google users must be currently enrolled in the program to be included in the new changes.”]
Source: https://securityintelligence.com/news/google-advances-two-step-verification/