First piece had to be returned because the charger pin was defective. Replacement was smooth. Phone has been working well for past one month. Very good signal reception for both sims. Good voice quality. Has vibration alert. Nice big display. Great battery life. For basic phone, it checks all the boxes. Nice look as well. Software interface is also ok.

It's a good basic phone. Short on various basic functionalities such as speed dial! Battery backup is superb (4 stars for product). Delivery is super slow (-2 stars for delivery). I had ordered on July 8th and it got delivered on July 20th (12 days wait for a phone that you can just step into a store and buy).

I ordered my karbonn k9 on 16th and it was dispatched the very next day.. they gave me a list of service centres near my place too.. hats off to flipkart service. about the phone: a low cost beauty. pros: dirt cheap rate. recharger wire clubs as a data-cable, so no need to buy it separately. large screen, splendid display. led torch is an added luxury pretty good battery life. os is pretty user friendly. music player is real loud, sounds terrific on headphones/speakers. music player/ video players support all common formats. messaging is easy. supports upto 16gb microsd. cons: good display goes unused as video player lacks video quality. the player rejects some files, dont know why, prob as they are above 15mb. battery size is 1800mh, which burns ur pocket if a replacement is required.. costs about 500rs. music sound is loud, but not really pleasing to keep it going. a headset is recommended. photo viewer rejects files above 450 kb size. keypad looks fragile. the phone could probably hang up if memory slot is overloaded. the camera is a namesake one, but it could turn out handy The reason i opted for this phone is that i wanted a low cost phone for my use till end of next year when im slated to get an android. and i think this model is just too perfect for my situation. a 1.8k phone with all possible features i could probably need, including gprs. nokia handsets offering the same features would have cost me atleast 4k, which is more than two k9s. in all, im happy with its performance. its not the best out there, but probably the best for such a cheap rate. perfect if u want something of everything(features) for cheap. the body is simple and neat, luks gud at a glance. rating: 4/5.

For a phone that retails at this price point, the Jumbo K9 is a decent buy. After using it for 2 weeks, I thought I should put in words what I think about this Karbonn product. Pros: 1. Good large screen for this budget, easy to the eye. 2. Really good battery back-up (main reason for me having this phone)..easily lasts 4-5 days with average multimedia usage. 3. Decent calling capabilities, though voice does seem unclear sometimes from the other end. 4. One-touch calling (a plus point for a dual-SIM phone). 5. Memory storage capacity (16 GB!). 6. Dual-active SIM! 7. Fast and responsive OS, no lag noticed. 8. WAP is very decent....good for checking e-mails on the go. Cons: 1. The loudspeaker is very mediocre..songs do not 'sound' good at all...definitely need a good pair of headphone to hear music! 2. Keypad is small, not for people who chat a lot using SMS (not a big issue for me though as I am an infrequent 'messager')! 3. The video player and image viewer rejects some files on criteria that are not known to the user (some large files play, some don't! some mp4/avi files play, while some don't!). 4. No data cable, so to remove the memory card every time, you have to remove the battery as well! 5. The camera is plain poor...really of no use...and definitely not a 1.3 MP camera as claimed by the manufacturer...should not have been here...would've been a few bucks cheaper! 6. Really poor built and is fragile (so handle with care); the screen too is a dust/finger-print magnet! All in all, if you are a frequent traveler and need a dual-active SIM phone mainly for calling purpose with a good battery back-up and storage capability...and are willing to 'care' for it at a very reasonable price, go for Jumbo K9...that's precisely why I got it. :-)

Great features for a such a price range! Thanks Flipkart for the awesome service! For the same features other phones will cost atleast Rs4000. call recording,mp3,mp4 playback,music and video player,super nice big and bright screen with good resolution! Has call recording,mobile tracking software,timer,etc etc Camera is very good for 1.3mp with features like night mode,continuous pic capture upto 9 pics per click The phone is very fast and quick and the User Interface is very easy to use! The dual LED torchlight works wonders(very powerful!) Games are Pacman,Snake You can individually Password lock phonebook,messages,call history,file manager. And last but not the least, Battery life! When i received the phone the batter was half in the indicator, I used it for 4.5 days without charging( i played music,vids, used the camera etc during these days and etc) Exceptionally Good Battery life! Its also sits well in the hand and feels right Overall, i'm more than pleased with the device!