India's mobile market has seen a meteoric rise in the last few years, and it doesn't look like the growth will abate anytime soon. A key part of that vision is 4G connectivity, which has been rolling out in phases since 2012. One of the key stories in the country's digital transformation in 2016 was the launch of Reliance Jio. Jio made its debut late last year, offering affordable tariffs and a robust network that's built entirely on 4G. The fact that the carrier gave away huge amounts of data for free for everyone for the first six months allowed it to climb up the ranks in a short time, amassing over 100 million subscribers already. When it comes to 4G, Jio is in the lead by a huge margin. Here's what you need to know about the state of 4G in India. Verizon is offering the Pixel 4a for just $10/mo on new Unlimited lines

4G bands and frequencies

When compared to 3G, 4G offers greater bandwidth at a lower latency, with downloads quoted in the vicinity of 45Mbps. However, receiving those speeds is entirely reliant on network connectivity and congestion, which was a major issue during the 3G rollout. Carriers often saw a high amount of congestion on their networks, which meant that most customers never saw the claimed download speeds. This time around, carriers are looking to mitigate the issue of congestion by investing heavily in infrastructure. That said, there's still no guarantee that you'll actually see the claimed download seeds. For instance, although Airtel offers 4G in Hyderabad, the bandwidth is only marginally higher than what you get on 3G. If you're looking to buy a 4G phone in India, look for Bands 3, 5, and 40. Indian carriers are leveraging both TDD-LTE and FDD-LTE standards to offer 4G connectivity in the country. The government auctions spectrum to the carriers for a duration of twenty years, with the most recent auction netting over $16 billion in revenue. The government was slated to offer up huge chunks of the 700MHz frequency in an auction last year, but there were no takers. Low-frequency bands offer a wider range and are unaffected by buildings, whereas higher frequency bands such as 2300MHz can transfer more bandwidth over a smaller area. Band 3 (1800MHz) is primarily used for 4G coverage in India, as the spectrum was already in use during the 2G era. Carriers that offer 4G on Band 3 include Aircel, Airtel, Idea, Reliance Communications, Reliance Jio, Telenor, Vodafone, and Videocon. Band 40 (2300MHz) is the second frequency on which carriers offer 4G connectivity. The government had auctioned airwaves in this spectrum to Aircel, Airtel, Reliance Jio, and Tikona in 2010. Reliance's pan-India network primarily relies on the 2300MHz frequency for cellular coverage. Band 5 (850MHz) will be used by Reliance Jio and Reliance Communications in ten circles. If you're interested in purchasing a handset to access 4G connectivity, make sure the phone supports Bands 3, 5, and 40. Carriers and their circles India's 29 states and seven union territories are broken down into 22 telecom circles, which are largely defined by state boundaries. Moving between circles incurs roaming charges for calls and texts, which is a main reason why phones with two SIM card slots are preferred in the country. Having two SIM slots available makes it that much more convenient for those traveling between two circles to cut down on charges. Here's the breakdown of the telecom circles in India: Andhra Pradesh and Telangana

Assam

Bihar & Jharkhand

Delhi

Gujarat and Daman and Diu

Haryana

Himachal Pradesh

Jammu and Kashmir

Karnataka

Kerala and Lakshadweep

Kolkata

Madhya Pradesh and Chhattisgarh

Maharashtra and Goa

Mumbai

Odisha

Punjab

North East (Arunachal Pradesh, Manipur, Meghalaya, Mizoram, Nagaland, and Tripura)

Rajasthan

Tamil Nadu

Uttar Pradesh (East)

Uttar Pradesh (West) and Uttarakhand

West Bengal Airtel

Airtel was the first to offer 4G services in India all the way back in 2012. Dubbed the "widest 4G network" in India, Airtel is offering 4G in over 420 cities across 15 circles. The carrier operates on the 2300MHz frequency and has access to 20MHz of bandwidth, along with a license to offer data on the 1800MHz frequency in six circles. Airtel has a user base in excess of 10 million, with that number set to gain a massive increase by the end of 2017. The carrier has extended its 4G network 15 kilometers off the coastline at the behest of the Indian Navy. On the 2300MHz frequency, Airtel has a license in eight out of 22 circles in India (Delhi, Mumbai, Kolkata, Karnataka, Maharashtra, Haryana, Kerala, and Punjab) and has acquired access to Aircel's spectrum in eight additional circles in 2016: Tamil Nadu (including Chennai), Bihar, Jammu and Kashmir, West Bengal, Assam, North East, Andhra Pradesh, and Odisha. The move puts Airtel in a much better position to face the imminent arrival of Reliance Jio. Airtel also offers its own suite of music, movie, and game streaming apps on Android and iOS, dubbed Wynk. You can choose to subscribe to Wynk separately for ₹99 a month, or buy a bundled plan that offers these services for free. For instance, 1GB of 4G data combined with a 28-day subscription to Wynk Music (including unlimited song downloads) currently costs ₹279, whereas a standalone data plan costs ₹259. In essence, you're getting Wynk Music for just ₹20. If you're looking to make the switch to Airtel's 4G network, head down to the link below to see the coverage and tariff for your locale. See at Airtel Reliance Jio

Reliance Jio has the most amount of liberalized spectrum among Indian carriers, with a nationwide license on the 2300MHz frequency, along with airwaves in the 1800MHz band and 10MHz spectrum in the 850MHz frequency that's purchased from RCOM in ten circles: Assam, Bihar, Haryana, Himachal Pradesh, Jammu and Kashmir, Madhya Pradesh, Mumbai, North East, Odisha, and Uttar Pradesh (East). One of the key differentiators with Jio's network is VoLTE, which allows for high-definition voice calls to be placed over the data network. The carrier has integrated 4G network that leverages all three frequencies to provide seamless connectivity, and is using its network to deliver a robust on-demand digital content platform. With over 100 million subscribers, Jio is the frontrunner in the Indian 4G market, but the customer acquisition has led to sustained losses at the carrier. Idea and Vodafone