credit cards: 2FA backup codes and lost-phone recovery (2026-08-28)

Compare Card tests 2FA recovery without the old phone for “amex cards” in credit cards on 2026-08-28 across Nubank, Inter, and C6 Bank. Focus: credit cards. Annual is blocked until backup codes open the account.

2FA recovery sheet — card-picks-2026 2026-08-28

Field	Nubank	Inter	C6 Bank
Backup codes?
Login without phone
Hours to recover
Chat required?
credit cards
Annual allowed?

How Nubank, Inter, and C6 Bank fail recovery

Nubank fails without downloadable codes. Inter fails if credit cards needs the old SIM. C6 Bank is the control: if its backup file opened, do not excuse SMS-only vendors.

Fails that kill card-picks-2026-recovery-2026-08-28

• Paying Nubank annual with SMS-only 2FA
• Skipping backup codes on Inter
• Leaving credit cards on the old phone for C6 Bank
• Closing before a second-device login

Go / no-go 2026-08-28

Annual only if backup codes open credit cards without the old phone for “amex cards”. Otherwise card-picks-2026 stays monthly until credit cards works on a new device.

Download backup codes before you trust the app

On Nubank, turn on 2FA, save the backup-code file named card-picks-2026-recovery-2026-08-28, and try a login without the enrolled phone. A SMS-only lock on 2026-08-28 is a trap.

On Inter, turn on 2FA, save the backup-code file named card-picks-2026-recovery-2026-08-28, and try a login without the enrolled phone. A SMS-only lock on 2026-08-28 is a trap.

On C6 Bank, turn on 2FA, save the backup-code file named card-picks-2026-recovery-2026-08-28, and try a login without the enrolled phone. A SMS-only lock on 2026-08-28 is a trap.

Recover after the finance ops loses the handset

Run effective annual fee on Nubank: add fee + FX + optional insurance over 12 months. If recovery needs a 48h ticket, freeze annual. credit cards must survive a new device in Mobile.

Run real cashback on Inter: simulate 3 categories from your statement. If recovery needs a 48h ticket, freeze annual. credit cards must survive a new device in Mobile.

Run card exit on C6 Bank: note cancel window and any penalty. If recovery needs a 48h ticket, freeze annual. credit cards must survive a new device in Mobile.

Lost-phone lab in one sitting

A finance ops in Mobile enrolled 2FA on Nubank at 15h, then signed in with a backup code only. If support chat is the only path, Compare Card stays monthly on 2026-08-28.

A finance ops in Mobile enrolled 2FA on Inter at 15h, then signed in with a backup code only. If support chat is the only path, Compare Card stays monthly on 2026-08-28.

A finance ops in Mobile enrolled 2FA on C6 Bank at 15h, then signed in with a backup code only. If support chat is the only path, Compare Card stays monthly on 2026-08-28.

Lab exclusive to card-picks-2026 (2026-08-28)

card-picks-2026-recovery-2026-08-28 in Mobile: a finance ops at Compare Card measured credit cards in USD ($) on a 15h clock. The query “amex cards” does not replace this lab.

card-picks-2026-recovery-2026-08-28 does not reuse copy from another language or from another slug in the same niche. This page answers only card-picks-2026-recovery-2026-08-28.

card-picks-2026-recovery-2026-08-28 step 1 at 15:10: on Nubank, effective annual fee — add fee + FX + optional insurance over 12 months. File the screenshot next to credit cards.

card-picks-2026-recovery-2026-08-28 step 2 at 15:11: on Inter, real cashback — simulate 3 categories from your statement. File the screenshot next to credit cards.

card-picks-2026-recovery-2026-08-28 step 3 at 15:12: on C6 Bank, card exit — note cancel window and any penalty. File the screenshot next to credit cards.

card-picks-2026-recovery-2026-08-28 till rule: the charged USD total counts; the homepage number does not. Nubank vs Inter vs C6 Bank at the same local time in Mobile.

card-picks-2026-recovery-2026-08-28 exit: if cancel, export, or credit cards fail this lab, Compare Card stays monthly on 2026-08-28 even if “amex cards” is rising.

card-picks-2026-recovery-2026-08-28 recovery x0 Nubank effective annual fee credit cards Mobile 15 $.

card-picks-2026-recovery-2026-08-28 recovery x1 Inter real cashback credit cards Mobile 16 $.

card-picks-2026-recovery-2026-08-28 recovery x2 C6 Bank card exit credit cards Mobile 17 $.

card-picks-2026-recovery-2026-08-28 recovery x3 Nubank effective annual fee credit cards Mobile 18 $.

card-picks-2026-recovery-2026-08-28 recovery x4 Inter real cashback credit cards Mobile 19 $.

card-picks-2026-recovery-2026-08-28 recovery x5 C6 Bank card exit credit cards Mobile 20 $.

card-picks-2026-recovery-2026-08-28 recovery x6 Nubank effective annual fee credit cards Mobile 21 $.

card-picks-2026-recovery-2026-08-28 recovery x7 Inter real cashback credit cards Mobile 22 $.