Don't follow the other phone design, stay independent
Develop your own operating system. They are a lot of people who own android phones because they don't want an Apple phone. Not because they like Android. Blackberry failed because the phones were too expensive and they did not have the features people wanted. Windows phone failed because Microsoft killed it (in many different ways); not because it was not a viable option that people liked.
Look at Jiophone, they are doing well in some places. You even have a phone with their OS and Facebook is supporting it with whats app. You have; more experience, connections, resources and patents to make an even better feature OS and wipe them out. Plus it would be good payback for them not allowing you all the features and apps possible on their phone on yours.
Your operating system can target the low end and feature phones so as not to upset Google. It would need to support touch input, up to 4.5 inch screens with resolutions up to 854x480. dual cameras up to 8MP, Whats app and other messaging apps. 3G/LTE, USBC. Phones are getting too expensive these days and you're not getting much for the added expense. It's time to give people a phone they can use at a decent price.Release 1 or 2 per quarter. There are still people who want a phone with a keyboard like the e71, personally I want one like the Symbian based x6 from 2010.
The Asha phones where ugly in my opinion. Too blocky. The Asha operating system however had potential. They just need a higher res screen and a nicer UI.
A Square size touchscreen display
A Square size qwerty keypad
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