The Complete US-India Traveler Phone Guide (2026)

Part 1: What Is Quo (formerly OpenPhone)?

How it works

How it differs from a real carrier

Is Quo useful for your use case?

• ✅ Your Quo number works in India the moment you land — no Wi-Fi calling toggle, no international plan. If you have internet (your Airtel India SIM provides that), Quo just works.
• ✅ You can have a permanent California area code (415, 628, 408, 650).
• ❌ No eSIM — Quo cannot serve as your cellular plan.
• ❌ No data for SF — you still need a real carrier.
• ❌ Frequent rejection from banks, WhatsApp number registration, and government SMS services, because VoIP numbers are flagged as non-cellular.
• ❌ No 911 — a real safety gap.

Can you port your Quo number to a real carrier?

1. Go to Settings in Quo → select your number → request port-out
2. Quo sends you your Account Number, PIN, and service address within 24–48 hours
3. Bring those credentials to your new carrier (Google Fi, T-Mobile, US Mobile, etc.)
4. Complete their LOA (Letter of Authorization)
5. Transfer completes in 3–10 business days (VoIP-to-wireless is classified as a wireline port, so it's slower than carrier-to-carrier)
6. Manually cancel your Quo subscription after — it does not auto-cancel

Part 2: Best US Carrier Plans for Your Use Case

• eSIM only
• California area code (415/628 = San Francisco)
• Fast data in SF when home
• Receive/make US calls + SMS in India via Wi-Fi calling (no cellular data from this SIM in India)
• Cost-efficient, long-term keeper

🥇 #1 Recommendation: Google Fi Flexible — ~$20–35/month

🥈 #2: US Mobile Unlimited Premium (Annual) — ~$25/month

🥉 #3: Mint Mobile Unlimited — $15/month (year 1), $30/month thereafter

• ✅ eSIM, California area codes, T-Mobile network
• ✅ Wi-Fi calling works in India (blocked only in China and North Korea)
• ⚠️ Requires upfront payment (3/6/12 months) — not ideal for uncertain schedules
• ⚠️ MVNO deprioritization during peak SF hours (Caltrain stations, Oracle Park, Moscone events)
• $15/month for the first 12 months is unbeatable if you know you'll commit

Other Options (Summary)

Part 3: Your Ideal Setup

1. Port your Quo number to Google Fi (or sign up for a new Google Fi number if you prefer a fresh start). This gives your existing number a real cellular identity — bank SMS, WhatsApp registration, and government codes will work, which Quo can't reliably do.
2. Keep your Airtel Indian eSIM as a second eSIM profile on your phone.
3. In India:
   • Airtel Indian eSIM: handles all data (4G/5G)
   • Google Fi eSIM: Wi-Fi calling ON, data roaming OFF — routes all US calls and SMS over your Airtel internet connection
   • Monthly cost: $20 (Fi base) + ₹300–600 (Airtel India plan) ≈ under $30 total
4. In SF:
   • Google Fi eSIM handles calls, SMS, and data
   • Monthly cost: $30–50 depending on data use

Quick Decision Summary

One More Note on Quo After Porting

Your Best Option: US Mobile or Mint Mobile

The Clear Winner: US Mobile

1. Accepts port-ins from VoIP/Quo — confirmed. Wireline port takes 3–10 days, costs nothing on your end.
2. eSIM on all three networks — you pick Verizon (best urban SF coverage), T-Mobile (best 5G breadth), or AT&T. You can switch networks anytime via their "Teleport" feature.
3. California area code — selectable at signup or preserved via port-in.
4. Cheapest unlimited with real data priority:
   • Annual plan: $299/year = ~$25/month (taxes included, no surprises)
   • Monthly option: $44/month
5. No residency restrictions — no policy issues for your India trips.
6. Wi-Fi calling and SMS work fine in the US natively.

Runner-Up: Mint Mobile

• Same T-Mobile network, eSIM, California area code, port-in supported.
• $15/month (first 12 months, 50% off promotion) → $30/month after.
• Catch: you must pay 3, 6, or 12 months upfront. If you're fine with that, the first year is extremely cheap.
• Slightly lower data priority than US Mobile's Verizon option during SF peak congestion (stadiums, downtown rush hour).
• Call forwarding for India works the same way.

What to Ignore

• T-Mobile direct / Verizon direct / AT&T direct — same underlying networks as US Mobile/Mint, but 2–3x the price. No additional benefit for your use case.
• Travel eSIMs (Airalo, Nomad, etc.) — data-only, no phone number, can't port into them. Not relevant here.

Your Plan of Action — Step by Step

• Choose Warp (Verizon) network for best SF urban coverage, or LightSpeed (T-Mobile) for widest 5G footprint. Either is excellent in SF.
• Pick your California area code at signup (you won't need this step if you're porting).
• Go annual for $299 upfront — saves ~$230 vs paying monthly.

• In Quo (Settings → your number → Port Out): request port credentials.
• Quo responds in 24–48 hours with your Account Number + PIN.
• Submit these to US Mobile with a Letter of Authorization.
• Wait 3–10 business days. Your number transfers automatically. Quo stays active until transfer completes.
• After port completes: cancel Quo manually.

• US Mobile sends a QR code or activation code. Scan it → your Quo number is now live on a real cellular eSIM.
• Test calls, SMS, and data in SF.

• Dial *72 [your Indian Airtel number] from your US Mobile line to activate call forwarding, OR use the US Mobile app's call forwarding setting.
• Put US Mobile eSIM on "data roaming OFF" in phone settings — you won't be using its data in India.
• Your Airtel Indian eSIM handles all data in India. Incoming US calls ring your Indian number via forwarding.
• When you return to the US, dial *73 to cancel call forwarding.

Cost Summary

Tello — Is It Relevant?

What Tello is

• A legitimate US MVNO (runs on T-Mobile's network)
• Full eSIM support
• California area codes available
• Port-ins accepted — including from VoIP/Quo numbers
• Month-to-month, no contracts, no upfront payment required

Pricing (2026)

Wi-Fi calling / India compatibility

• ✅ Wi-Fi calling works, including from India
• ✅ Call forwarding works the same way as any other carrier
• So your India-trip strategy works fine with Tello too

So Why Did I Not Recommend It as #1?

1. T-Mobile network only, lower priority. In urban San Francisco — downtown, Caltrain, crowded venues — MVNOs on T-Mobile get deprioritized behind direct T-Mobile customers during congestion. US Mobile on Verizon (Warp) avoids this entirely. Tello is noticeably more affected than US Mobile because US Mobile's premium plans carry higher network priority.
2. Reputation is more "nomad/minimalist" than "primary US number." It's very popular with people who need a cheap US number for SMS verification or occasional use — not as heavily used by people who rely on it as their main daily-driver in a dense city like SF.

Bottom Line

Step-by-Step: Port Quo → US Mobile

Phase 1 — Set Up US Mobile (Do This First)

• Pick Unlimited Premium (annual = $299/year, billed upfront)
• Choose your network: Warp (Verizon) for best SF urban coverage — this is the recommended pick

• Do NOT pick a new number here
• Enter your Quo number when asked
• US Mobile will start the port process from their end

• Pay, create your login, set up your profile
• US Mobile will ask for your Quo account details at this point OR send you an email to provide them

Phase 2 — Get Your Port-Out Credentials from Quo

• Select the number you want to port
• Fill in the reason (transfer to new carrier)
• Submit

• Quo emails you three things:
  • Your Account Number
  • Your PIN/Password
  • Your Service Address

Phase 3 — Complete the Port at US Mobile

• Log into your US Mobile account → go to the port-in section
• Enter: Account Number, PIN, Service Address exactly as Quo gave them
• Sign the Letter of Authorization (LOA) — it's a simple digital form

• Your number is still active on Quo during this time — keep using it normally
• US Mobile will notify you when the port date is confirmed
• On port day, your Quo number goes live on US Mobile automatically

Phase 4 — Activate Your eSIM

• Go to your iPhone/Android: Settings → Cellular → Add eSIM → Scan QR code
• Your Quo number is now a real cellular number on Verizon's network

• Make a call from your new US Mobile number ✅
• Send and receive an SMS ✅
• Test mobile data (turn off Wi-Fi, browse) ✅

Phase 5 — Clean Up Quo

• Quo does NOT auto-cancel after a port — you must do this yourself
• Go to Quo app → Settings → Billing → Cancel plan
• Do this only AFTER you confirm the number is live on US Mobile

For India Trips (When the Time Comes)

• Dial *72 followed by your Indian Airtel number (e.g., *72 +91XXXXXXXXXX) from your US Mobile line to activate call forwarding
• In phone Settings → Cellular → US Mobile eSIM → turn Data Roaming OFF
• Your Airtel eSIM handles all data in India; US calls forward to your Indian number

• Dial *73 to cancel call forwarding
• Turn Data Roaming back ON for US Mobile

Quick Summary Timeline

US Mobile Plans — Everything Explained

All Plans at a Glance

What Do These Plans Actually Mean?

Light ($8–10/mo)

Unlimited Flex ($17.50/mo)

Unlimited Starter ($16.58–25/mo)

Unlimited Premium ($24.92–44/mo)

• QCI 8 priority (explained below — this matters in SF)
• Unlimited hotspot (vs 20GB cap on Starter)
• Free network switching (Teleport) — switch between Verizon/T-Mobile/AT&T anytime at no cost
• 20GB international roaming included
• Free smartwatch plan bundled in

The One Thing That Really Matters: QCI Priority

• QCI 8 (Premium) = higher priority. In a crowded SF location — Caltrain, a Giants game, downtown at lunch — you're closer to the front of the queue. Speeds stay fast.
• QCI 9 (Flex/Starter) = lower priority. You're behind QCI 8 users. During congestion, you may see slowdowns.

Annual vs Monthly — What's the Difference?

• ONLY199 → Starter annual for $199 (confirmed active as of 2026)
• ONLY299 → Premium annual for $299
• ONLY39 → Premium monthly for $39/mo for 6 months (instead of $44)

What Should YOU Choose?

The answer: Unlimited Starter, Annual ($199/year = $16.58/month)

• Unlimited data — no throttle surprises
• 20GB hotspot — covers any laptop tethering needs
• $16.58/month is hard to beat for a full-featured primary US number
• The only thing you give up vs Premium is QCI 8 priority and unlimited hotspot

Consider Premium if:

• You stream a lot of video on your phone outside the house
• You regularly use your phone as a hotspot for your laptop in SF (more than 20GB/month)
• You want the peace of mind of top-tier network priority in crowded SF spots

Skip if:

• Flex — the 10GB cap will frustrate you as a primary daily-driver in SF
• Light — only 2GB, not enough

Bottom Line