Phone & SIM

Virtual phone numbers, SIM cards, and eSIM for developers — Google Voice, Talkatone, Giffgaff, Airalo. Get a US phone number for service signups and two-factor authentication.

Our recommendation: Google Voice is free with a US number. Talkatone for a free US number. Giffgaff or Airalo for physical/eSIM options.

Airalo

Global eSIM marketplace — instant data plans for 200+ countries, no physical SIM needed.

Paid

giffgaff

Cheap UK SIM card on the O2 network — get a UK phone number from anywhere.

Paid

Google Voice

Google's free US phone number for calls, texts, and voicemail.

Free

Talkatone

Free WiFi calling and texting with a US phone number.

Freemium

Ultra Mobile

Cheapest real US phone number on T-Mobile's network — from $3/month.

Paid