Buenos Aires is one or two hours ahead of New York, depending on the US season, so a US client’s whole working day fits inside yours. A developer in Córdoba on a San Francisco startup’s team, a design studio in Palermo with clients in Austin, or a creator in Rosario talking to US brands can take US calls at a desk, not in bed. Here is how the hours line up, how a +1 number fits each kind of work, and what to check first.
When do Argentine and US working hours overlap?
Argentina is on UTC-3 all year and does not use daylight saving time. The whole country, from Buenos Aires to Mendoza and Ushuaia, keeps the same clock (IANA tz database). US Eastern time is UTC-5 in winter and UTC-4 in summer, Central is an hour behind Eastern and Pacific three hours behind, and US summer runs from the second Sunday in March to the first Sunday in November (NIST).
Here is a US working day, 9 a.m. to 5 p.m., in Buenos Aires time:
| Your client is in | US summer, Buenos Aires time | US winter, Buenos Aires time |
|---|---|---|
| Eastern (New York, Boston, Miami) | 10 a.m. to 6 p.m. | 11 a.m. to 7 p.m. |
| Central (Chicago, Austin, Dallas) | 11 a.m. to 7 p.m. | noon to 8 p.m. |
| Pacific (San Francisco, Los Angeles, Seattle) | 1 p.m. to 9 p.m. | 2 p.m. to 10 p.m. |
The pattern is a late start on the US side. New York’s 9 a.m. is your mid-morning, so an early meeting there needs no alarm. The catch is the West Coast: a San Francisco team’s 4 p.m. review is 8 or 9 p.m. your time. If most of your clients are in California, shift your own day later, for example 11 a.m. to 7 p.m., and you cover their whole morning and the start of their afternoon.
The seasons run opposite. Your summer, December to February, is the US winter, when the gap with New York is two hours; in July it is one. US clocks go back on November 1, 2026 and forward on March 14, 2027, and each time US calls move by an hour on your clock while yours stays put. The US time-zone clock shows each zone right now.
How does a US number work from Argentina?
The TripoSIM US Virtual Number runs in the TripoSIM app over Wi-Fi or mobile data, next to your Argentine line on the same phone. On iPhone, add the TripoSIM web app to your Home Screen. On Android, install the TripoSIM app. You need an email address, a payment card and a short ID check with a photo ID and a selfie, about 2 minutes. You do not need a US address, an SSN or a US company.
Rules on internet calling differ by country, and on your network a call on the number is an internet call. Check with your regulator or mobile operator before you rely on calls, and keep your Argentine number for calls inside Argentina.
Texts from US senders reach your number in the US and appear in the app over your connection, and verification codes from apps arrive the same way. Wise, Payoneer and Upwork sent codes to a TripoSIM number in TripoSIM’s tests on October 3, 2026. Register each account with your real country.
Which setup fits your work?
Nearshore developers and designers. If you contract for a US team, stand-ups, design reviews and pairing happen on video and use no minutes. The phone covers what video does not: a founder who wants a quick word from the car, a recruiter, or a US vendor you need to reach. Put the number on your portfolio and profiles with your hours in the client’s time zone. The freelancers page and a US number for Upwork and Fiverr cover profiles and codes.
Agencies. A studio in Buenos Aires usually has one person who wins work and others who run it. Give each account manager their own number, app and ID check, so a client in Austin reaches the person who knows the project. One person can also hold several numbers, each with its own plan, for example one per client brand. The agencies page and one person, several US numbers have the options.
Creators. US brands and talent managers often want a short call before they sign. A +1 number in your media kit makes that an ordinary call for them, and voicemail catches calls while you film. Instagram, TikTok and Google sent codes in TripoSIM’s tests on October 3, 2026. See the creators page.
How many minutes does a small agency use?
Take Lucía and Tomás, a made-up example: they run a four-person design studio in Buenos Aires with clients in Texas and California, and each has their own US number.
Lucía handles new business. She calls back about 12 leads a month for 15 minutes each, 180 minutes, and has a 15-minute weekly call with a US development partner, about 65 minutes. That is about 245 minutes, inside the 300 minutes a month to the US and Canada. Each outgoing call is rounded up to the next full minute; unanswered calls are free.
Tomás runs the accounts. Three 20-minute client calls a week come to about 260 minutes a month, which also fits. In a launch month he adds six 20-minute calls, 120 minutes, and reaches about 380. He buys extra minutes in the app at $5 per 100, or asks clients to call him: calls to him do not use his minutes and come from a separate fair use of 300 minutes a month. The cost calculator works out your own month.
What should your contact page and voicemail say?
Because your day covers theirs, give live hours in the client’s time zone and say where you are:
US line: +1 (your number). (Studio name), design and development from Buenos Aires, Argentina. We answer Monday to Friday, 9 a.m. to 5 p.m. Eastern, and until 2 p.m. Pacific. Leave a voicemail at any time, or email (your address) for briefs and files.
Record the greeting in English; if some of your US clients speak Spanish, add one short sentence in Spanish. Write “call or email”, not “call or text”, and give your real city: a US area code makes you easy to call, but it does not give you a US office. Voicemail messages can be up to 2 minutes, up to 30 a month, kept 30 days. The business contact checklist and the voicemail guide have more.
What can’t the number do?
- No sending texts. It receives texts only. For chat, clients can use email, your team’s chat tool or WhatsApp, which you can set up on the same US number.
- No calls out beyond the US and Canada. Use your Argentine line for Argentine numbers.
- No 911. It cannot call 911 or any emergency service, so keep your Argentine number for emergencies.
- Not a shared studio line. Each number is one person’s line for personal and small-business use, and call centers are not allowed.
The bottom line
From Argentina, US calls fit your normal day: New York from 10 or 11 a.m. Buenos Aires time, depending on the US season, and California from early afternoon into the evening. Give US clients a +1 number with your hours in their time zone, give each account manager their own line, and let voicemail take the rest. Check the rules on internet calling first, then test calls with the ten-check reliability test. For other countries, see US phone numbers by country. The plans page has both plans: $100 a year or $12.99 a month.