Is it good to buy. .tell me about Samsung email series
Samsung has no email services.
Galaxy budget devices are not a great buy.
i'd suggest go going for : Asus Zenfone 2 Laser 5.5 16GB
64 bit quad core2GB ram3k mah battery for all day battery lifeSD card slotand 13 mp laser auto focus camera and 5 mp front camera.
comes with a much better hardware.
What About Lenovo K3 Note
K3 Note Features ,Comparison With Samsung Galaxy J7
Both are from different price range.
Samsung phones are pretty bad in this budget because although they have decent specs and hardware they run Android with Touchwiz skin which is quite heavy and will slow down considerably over time and even thier high end phones have same issue so mid range will have more problems soon.
Lenovo K3 Note is a good phone but even Lenovo uses a skinned version of android which isn't as smoother or as good as other optimized OS.
Same budget i'd suggest going with Moto G 3rd Gen which has best in class camera and battery life.
It also comes with 2GB ram and stock android 5.1.1 making it one of the smoothest and fastest phones in this price range, it will also be one of the first non nexus devices to get android 6.0 marshmallow update.
If dual sim and 4G are not an requirement for you, you can even go for Xiaomi Mi4 its the best phone you can get in this price range has top end specs with s801 chip, 3GB ram and easily the best camera back and front camera in this budget with 5 inch full HD screen and large 3k mah battery for all day battery life.
More about Samsung Galaxy O5
Samsung Galaxy O5 is available with mentioned stores as on September 17, 2019. Samsung Galaxy O5 online store price is applicable to all cities including Mumbai, Delhi, Bangalore, Chennai, Pune, Kolkata, Hyderabad, Cochin, Jaipur, Patna, Ahmedabad, Chandigarh, Lucknow, Nagpur, Surat, Indore, Agra, Thane, Gurgaon, Noida. The price for Samsung Galaxy O5 is for new Mobiles and not of second hand or used Samsung Galaxy O5. The page was last updated on September 17, 2019.