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United States +1

International code · North America

Key facts

International code+1

International format+1 XXX XXX XXXX

Mobile prefixes(XXX) XXX-XXXX

Mobile length10 digits

Landline format(XXX) XXX-XXXX

Domestic trunk1

Number ranges & quality

Range	Type	Notes
`无号段区分`	Mobile carrier	北美 +1 下不按号段区分运营商，实体卡和虚拟号混在同一片号池里

Intl SMSStable

Virtual-number riskHigh

ID required预付费卡基本不查身份；也正因如此，VoIP 号（Google Voice、TextNow 等）泛滥

美国号的问题是反过来的：不是地区不支持，而是虚拟号太多。Google Voice / TextNow 这类号被 ChatGPT、WhatsApp 明确拒绝，必须用实体 SIM。

Sign-up availability

What to expect when signing up for these services with a physical SIM from this country:

ChatGPT Works

Claude Works

WhatsApp Works

Telegram Works

LINE Works

WeChat Works

X Works

TikTok Works

Gemini Works

Applies to every platform: VoIP / virtual numbers and heavily-reused number pools get rejected. Physical SIM only.

Checked 2026-09-12. Platform region policies and number-range allocations change — always confirm against each platform’s official supported-regions list and the carrier’s notices.

Sources：help.openai.com/articles/7947663 · www.anthropic.com/supported-countries · support.google.com/gemini?p=gemini_web_availability

Calling United States from abroad

Dial +1, then the local number with the leading 0 stripped. A Beijing landline 010-1234-5678 is dialed as +1 10 1234 5678.

Generate the full number →

Dialing within United States

For domestic long distance dial 1 first, then the area code. Local calls and mobiles: dial directly.

Other countries using `+1`

Elsewhere in North America

Traveling to United States? Get a SIM card

eSIM providers like Airalo and Holafly charge by the day and work the moment you land. Common picks below:

Affiliate links pending — sign-up under review.