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I just called Airtel CC and this is the info I got.<br />
<span style="color: rgb(41, 105, 176)">"If I deactivate auto-debit, then my Outgoing will stop immediately after current plan expiry and Incoming will stop after 14 days."</span><br />
As I need only incoming on this number, I will let my outgoing stop and recharge again after 13 days to extend SIM active.<br />
In nutshell, at present I am getting 28 days incoming validity for 23 Rs/-. Later I will get 42 days validity for the same amount.<br />
Lets hope it works as planed <img src="/community/data/assets/smilies/idea.gif" class="smilie" loading="lazy" alt=":idea:" title="Idea :idea:" data-shortname=":idea:" />
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</blockquote>Yes, a better option is:<br />
1. Disable the auto-debit using *121*777#<br />
2. After your plan expires after 28 days, incoming will continue for 15 days. Dial *123# anytime to check Incoming validity.<br />
3. On the 16th day incoming will stop. Now recharge Rs 35. This gives you Rs 26.66 talktime. And extends outgoing validity by 28 days and incoming validity by 28+15 = 43 days. Hence, effective cost = (35 - 26.66) = Rs 8.34.<br />
4. Thus, for Rs 8.34, you get 43 days validity. This works out to be Rs 70.79 per year. Probably this is the ARPU calculation by the telcos to get in at least Rs 70 per user per year.<br />
5. RISK: You may risk this by not recharging your number till 90 days post plan expiry. So this gives you 28+90 = 118 days for Rs 8.34. This now works out to be Rs 25.79 per year.<br />
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Note: Once incoming validity expires, Airtel stops incoming SMS too, but Vodafone allows incoming SMS till 90 days (in case you want to use for OTP, then only Vodafone will work for u, Airtel will not).</div>