Twitter not forwarding messages

Twitter is used to get the updates of your dear ones or friends either on PC or you can choose a device like cellphone to get the updates. This is a cool thing to get connected with your friends and know what they are doing.
I have started using Twitter sometime back and found it pretty impressive as one can also use it to publicize their sites or blogs.
But recently there seems to be a bug in it, as it is not relaying (forwarding) all the messages of the people i am following to my selected device (Cellphone).

Twitter - charges for cellphones

I found twitter not that useful but this is post for all those who want to know the pricing of sending and receiving sms using the twitter service which states in its "Terms of use" that all the sending and receiving is free. I used this service for a month and i am using airtel (Delhi) postpaid connection. So the receiving is free but there is charge of Rs.3 per sms that you send to twitter website which further gets relayed to your twitter friends.