Do USA unlocked phones work in India?
These days, most tourists want to use their cell phones in India, especially now that smartphones have become so essential. After all, who doesn't want to post constant updates to Facebook to make their friends and family jealous! However, there are some important things that you need to know. This is particularly so for anyone coming from the United States because India's network operates on a GSM (Global System for Mobile Communications) protocol, not a CDMA (Code-Division Multiple Access) protocol.
In the United States, GSM is used by AT&T and T-Mobile, while CDMA is the protocol for Verizon and Sprint. Hence, it may not be as simple as just taking your cell phone with you and using it.
The GSM Network in India
Like Europe and most of the world, the GSM frequency bands in India are 900 megahertz and 1,800 megahertz. This means that for your phone to work in India, it must be compatible with these frequencies on a GSM network. (In North America, the common GSM frequencies are 850/1900 megahertz). Nowadays, phones are conveniently made with tri bands and even quad bands. Many phones are also made with dual modes. These phones, known as global phones, can be used on either GSM or CDMA networks according to user preference.
To Roam or Not to Roam
So, you have the necessary GSM phone and you're with a GSM carrier. What about roaming with it in India? Make sure you thoroughly investigate the roaming plans on offer.
Otherwise, you could end up with a shockingly expensive bill when you get home! This is particularly the case with AT&T in the United States. Fortunately, the international plans for T-Mobile customers are much more cost-effective for roaming in India.
Using Your Unlocked GSM Cell Phone in India
To save money, especially if you're going to be using your cell phone a lot, the best solution is to have an unlocked GSM phone that will accept the SIM (Subscriber Information Module) cards of other carriers, and to put a local SIM card in it.
A quad-band unlocked GSM phone will be compatible with most GSM networks worldwide, including India.
However, US cell phone carriers usually lock GSM phones to prevent customers from using other companies' SIM cards. In order for the phone to be unlocked, certain conditions must be met. You can possibly jailbreak your phone to get it unlocked but this will void its warranty.
Thus, ideally, you will have purchased a factory unlocked phone without a contract commitment.
Getting a SIM Card in India
In early 2016, the Indian government announced that it planned to give free kits with SIM cards to tourists arriving on e-visas. It's uncertain when this will happen though. Meanwhile, prepaid SIM cards with a maximum three months validity can be purchased inexpensively in India. Most international airports have counters that sell them. Otherwise, try cell phone stores or the retail outlets of phone companies. The most popular companies are Airtel, Vodafone, and Reliance. They all offer similar rates, although coverage may vary outside major cities. You'll need to buy separate "recharge" coupons or "top-ups" for "talk time" (voice) and data.
However, before you can use your phone, the SIM card must be activated.
This process can be very frustrating and sellers can be reluctant to bother with it. Due to the increased risk of terrorism, foreigners need to provide identification including passport photo, photocopy of passport details page, photocopy of Indian visa page, proof of home address in country of residence (such as driver's license), proof of address in India (such as hotel address), and a local reference in India (such as hotel or tour operator). It can take up to five days for verification to be completed and the SIM card to start working.
What About Getting a Roaming SIM in the US?
Plenty of companies offer SIM cards for people traveling overseas. However, most of their rates for India are high enough to deter you, even if you don't want the hassle of getting a local SIM in India. The most reasonable company is iRoam (formerly G3 Wireless).
Don't Have an Unlocked GSM Cell Phone?
Don't despair! There are a couple of options. Consider buying a cheap GSM phone that's unlocked for international use. It's possible to get one for under $100. Alternatively, only use wireless Internet. Your phone will still connect over WiFi without any problems and you can use Skype or FaceTime to keep in touch. The only problem is that WiFi signals and speeds are highly variable in India.
Just check for LTE bands, 3G bands are usually included so ignore.
Rest no restriction. US blacklisted work in India as Indian carrier do not blacklist phones based on IMEI.