If this is true how can iPhone 6 bought in US Model 1549? be used with Airtel 4G in India in Maharashtra Circle in Pune.
Airtel’s 4G services, the trials of which premiered about a month ago, are currently incompatible with the bandwidth supported on Apple’s top-of-the-line iPhone 6 and 6 Plus. The TDD form, on which the LTE connectivity is being provided in the Delhi NCR circle by Airtel, is incompatible with the iPhones, and has deemed them invalid to connect to Airtel’s LTE, as of now.
TDD, the Time-Division Duplex of LTE, provides connectivity on 2300MHz frequency band, while FDD (Frequency-Division Duplex) provides connectivity on 1800MHz frequency band. The iPhone 6 and 6 Plus models A1549 and A1522 on GSM and CDMA networks connect to LTE networks via bands 1-29, which fall within FDD bandwidth. Airtel, who first initiated 4G services in Kolkata back in 2012, had been initially rolling out 4G connectivity on FDD bandwidth. Recently, it started beta-testing TDD bandwidth network in a number of cities, including Delhi NCR.
Initially, Apple had rolled out an upgrade to make the Indian versions of the iPhones 4G-compliant. The models A1586 and A1524 of the iPhone 6 and 6 Plus support LTE bands 38-41, which are TDD-based networks. Unless your iPhone happens to be one of these models, you will not be able to connect to Airtel 4G, which, as mentioned above, is on TDD bandwidth. There is little or no possibility of any firmware upgrades to make the devices compliant to the higher frequency bandwidth, since these happen to be the global differentiation within iPhone models.
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