Ask HN: How do I Reduce The Risk or Stop SIM Swapping Attacks?

Google Fi, and Mint Mobile are two MVNOs that claim to prevent again sim swapping [0][1]. Mint Mobile offers TOTP, and Google Fi is linked to your Google account, so you can add U2F&#x2F;TOTP MFA. However, it&#x27;s still possible for a T-Mobile retail employee to hijack a Google Fi, or Mint Mobile number?<p>Both MVNOs use T-Mobile for their backend, but Google Fi uses US Cellular as well. There have been documented cases of retail T-Mobile employees conducting sim swaps. There has also been documented cases of Mint Mobile users getting sim swapped [2][3][4][5][6]. So, are MVNOs really not vulnerable to sim swapping? Are VOIP services like Google Voice the only secure alternative to prevent sim swapping attacks[7]?<p>0. https:&#x2F;&#x2F;support.google.com&#x2F;fi&#x2F;answer&#x2F;9834243<p>1. https:&#x2F;&#x2F;old.reddit.com&#x2F;r&#x2F;mintmobile&#x2F;comments&#x2F;jw21qf&#x2F;how_does_mint_prevent_sim_swapping&#x2F;<p>2. https:&#x2F;&#x2F;old.reddit.com&#x2F;r&#x2F;mintmobile&#x2F;comments&#x2F;113dyvi&#x2F;sim_swap_a_few_days_ago_day_3_of_still_not_having&#x2F;<p>3. https:&#x2F;&#x2F;old.reddit.com&#x2F;r&#x2F;mintmobile&#x2F;comments&#x2F;t4g4g3&#x2F;i_just_got_sim_swapped_and_im_terrified_this_was&#x2F;<p>4. https:&#x2F;&#x2F;old.reddit.com&#x2F;r&#x2F;mintmobile&#x2F;comments&#x2F;nw4gth&#x2F;just_got_sim_swap_hacked&#x2F;<p>5. https:&#x2F;&#x2F;old.reddit.com&#x2F;r&#x2F;mintmobile&#x2F;comments&#x2F;jw21qf&#x2F;how_does_mint_prevent_sim_swapping&#x2F;<p>6. https:&#x2F;&#x2F;old.reddit.com&#x2F;r&#x2F;GoogleFi&#x2F;comments&#x2F;10qes3h&#x2F;at_least_one_google_fi_customer_had_accounts&#x2F;<p>7. https:&#x2F;&#x2F;krebsonsecurity.com&#x2F;2018&#x2F;11&#x2F;busting-sim-swappers-and-sim-swap-myths&#x2F;