Most providers has an easy way to change plans. But with Tata Docomo it is a head ache. I have two tata docomo postpaid numbers with 350 plan. I wanted to change plan to 222. For one number, they changed the plan and said it will reflect in the next bill. For the second one I have been calling many times and they said it is not available. As per their request I sent a mail on 24th evening. They replied back telling there is no such plan. Then I sent them the screenshot from website and they got that mail just past 12 AM. Now they are telling that the plan is available, but since they realized it only after 12AM (and my billing cycle start from 25th) I will have to wait for one month exactly and the plan will be active from next month 25th. They could improve their systems to process these things automatically, make customer care reps more educated about the plans and introduce prorated mid month plan change like other providers.