Keep Your Indian SIM Active Abroad: The 90-Day Rule Explained

You landed in the UK with your Indian SIM still in your phone. You used it for the first few days, then switched to a UK eSIM. A month later, you get the SMS: "Your number will be deactivated if no recharge is done by [date]."

This guide shows you the cheapest way to keep your Indian number alive — for bank OTPs, UPI alerts and WhatsApp — without paying for international roaming you don't need.

The 90-Day Rule and What 'Incoming Stopped' Means

Indian telecom operators deactivate prepaid numbers after a period of no recharges. The grace period is typically 90 days from the last recharge. If you don't top up before that date, your number is pulled from the active pool.

Here is what each operator actually does:

Operator	Deactivation window	What you receive
Airtel	90 days	SMS warning before deactivation
Jio	90 days	SMS warning before deactivation
Vi	90 days	SMS warning before deactivation
BSNL	90 days (varies by circle)	SMS warning, less consistent

The warning SMS says "incoming will be stopped" or "services will be stopped". This means the operator will stop delivering incoming calls and SMS to your number. You will not receive OTPs. Your number will eventually be reassigned to someone else.

The fix is simple: do a recharge before the deadline. You do not need a big top-up. You need a validity-only plan.

Cheapest Validity-Only Plans Per Operator

Validity-only plans keep your number active without adding talktime or data. You pay for the time, not the usage. These are the plans that matter when you're abroad.

Prices below are pulled live from Slashtel's recharge page at the time of writing. They are in INR and converted at checkout.

Operator	Plan	Validity	Price (INR)
Airtel	₹299	365 days	₹299
Airtel	₹79	28 days	₹79
Jio	₹399	365 days	₹399
Jio	₹98	28 days	₹98
Vi	₹299	365 days	₹299
Vi	₹79	28 days	₹79
BSNL	₹107	30 days	₹107
BSNL	₹397	365 days	₹397

The 365-day plans are the best value if you're in the UK for a full year. One recharge, done. The 28-day plans suit shorter trips or if you want to test that the recharge process works before committing.

Choose the operator you have. If you're on Airtel, the ₹299 plan keeps your number active for a full year for about £3. That is less than a coffee in London.

International Roaming Pack vs Domestic Validity Recharge

This is where most guides get it wrong. Airtel's own blog pushes international roaming packs because they cost more. You need to know the honest answer: for most people, domestic validity is enough.

Airtel, Jio, Vi: domestic validity is enough for OTPs on Wi-Fi calling.

All three operators support Wi-Fi calling on iPhones and most modern Android phones. When your phone is connected to Wi-Fi, the Indian number registers over the internet. OTPs arrive as normal SMS messages, and you can receive calls too. You need an active domestic validity plan — the ₹79 or ₹299 plans above work.

BSNL: domestic validity may not be enough.

BSNL's Wi-Fi calling rollout is incomplete. In many circles, it simply does not work. If you're on BSNL, test Wi-Fi calling before relying on it. If it doesn't work, you need an international roaming pack to receive OTPs, or you need to switch to a different operator on your next visit to India.

When you actually need an international roaming pack:

• You need to make or receive calls on the cellular network (not Wi-Fi)
• Your phone does not support Wi-Fi calling
• You are in a country where Wi-Fi calling is not available for your operator
• You need mobile data on the Indian SIM itself (unlikely — you have a UK eSIM for that)

For bank OTPs, UPI alerts and WhatsApp verification, domestic validity plus Wi-Fi calling covers you on Airtel, Jio and Vi. Do not buy an IR pack unless you've confirmed Wi-Fi calling doesn't work for you.

How to Recharge from the UK by Card in 60 Seconds

You don't need an Indian bank account, UPI or a friend in India to do this. Slashtel processes the recharge from the UK, and you pay by card.

1. Go to slashtel.com/recharge
2. Enter your Indian mobile number
3. Select your operator (Airtel, Jio, Vi or BSNL)
4. Choose the validity plan you want
5. Pay by card — the fee is £0.49 and is shown before you pay
6. The recharge is applied instantly

The whole process takes under a minute. You get a confirmation on screen and by email. No app install, no OTP verification loop, no Indian payment gateway asking for UPI.

This works from anywhere in the world, not just the UK. If you're in the US, UAE or Europe, the same process applies.

Set a 28-Day Reminder and Keep the Indian Line On

The biggest risk isn't the recharge itself — it's forgetting to do the next one. Here's a setup that makes it almost impossible to lose your number.

Dual-SIM setup:

• Put your UK eSIM as the primary line for data and calls
• Put your Indian SIM in the secondary slot
• Enable Wi-Fi calling on the Indian line
• Set the Indian line to use the UK eSIM's data for Wi-Fi calling fallback

On iPhone: Settings → Cellular → your Indian line → Wi-Fi Calling → On. Then set "Cellular Data on Other Line" to allow calls over the UK eSIM's data when not on Wi-Fi.

On Android: Settings → Connections → SIM card manager → your Indian SIM → Wi-Fi calling → On.

The reminder:

Your recharge validity is shown in the operator's app. Airtel's app shows the expiry date clearly. Jio's app does too. Vi's app is less clear, so dial 1991# from the Indian line to check.

Set a recurring calendar reminder for 28 days before the expiry date. If you bought the 365-day plan, set one reminder for 11 months out. If you bought the 28-day plan, set a monthly reminder.

One more thing: keep the Indian SIM physically in your phone. If you remove it and put it in a drawer, you might forget it exists. The dual-SIM setup means it stays active and you stay covered.

FAQ

Will I receive OTPs without roaming?

On Airtel, Jio and Vi, yes — as long as Wi-Fi calling is enabled and you have an active domestic validity plan. OTPs arrive as SMS over Wi-Fi. On BSNL, it depends on your circle; test it before relying on it.

What if my number is already deactivated?

You cannot recharge a deactivated number online. The recharge will fail. You need to contact the operator's customer care or visit a store in India. Reactivation is not guaranteed. Recharge before the deactivation date.

Can I recharge my DTH from abroad too?

Yes. Slashtel processes DTH recharges for Tata Play, Airtel Digital TV, Dish TV and Sun Direct. Same card payment, same instant delivery.

Which operator has the cheapest 365-day validity plan?

Airtel and Vi both offer ₹299 for 365 days. Jio is ₹399. BSNL is ₹397. Airtel and Vi are the cheapest for a full year of validity.

Do I need an Indian bank account to recharge from the UK?

No. Slashtel accepts international cards. You pay in USD or GBP. The recharge is applied in INR to your Indian number.

How do I check my current validity?

Dial *121# on Airtel, *1# on Jio, 1991# on Vi, or *123# on BSNL. The operator's app also shows the expiry date.

The Bottom Line

Keep your Indian SIM active with a validity-only recharge. On Airtel, Jio or Vi, domestic validity plus Wi-Fi calling covers OTPs and incoming calls. You do not need an international roaming pack.

The ₹299 Airtel plan costs about £3 and lasts a year. That is the cheapest insurance you can buy for your Indian number.

Recharge now — before the deactivation date passes.

Recharge your Indian SIM