Topic that just shows demanding content but where visitors don't click on ads doesn't make you any money. So displaying prices, plans, and telecom related content does not earn you much. The traffic that doesn't click on ads and earns you nothing is useless. So you have to take some strong decisions here.
I suggest you to slowly change your website focus onto tutorials of android and iphone. Or even tutorials on sailfish or other mobile OS. The reason being this change would compliment your existing content. And after that slowly remove older content. This would result in traffic drop but better that way than not earning at all. You do get some clicks on ads if you focus on tutorials. And please make unique and original content, do not copy paste. If you feel like copy pasting, i'd better say don't post that content at all.
Your website design is very good, just redo the ad placement after you change the content. I like the theme of the website too.
Rather than just providing information of tariff plans, convert your blog to something that deals with technology. I may not be able to present any suggestion here as it will solely be dependent on what topic you are comfortable with. But, to give a broader idea, it would be nice to have a "How To" niche. If you are fine with explaining things in a "How To" guide, it will get better traffic and income.
Another good idea will be to have articles that deal with Top lists. Like the top five services that provide good internet speed and such. You may consider coming up with apps reviews. The reviews need not be technical in nature. You can try the new applications available and write on your experience with them.
Live....and Let Live!
As a am also running few other blogs like coupon website www.lifestyleiit.com , free ads site wwww.classifiedsbazaar.com and wordpress guide www.bloggeriit.com can you also suggest me regrading these sites too. i am really happy to work on your suggestions