As per china mobilemag.com review the reception are weak
Reception, Voice & Audio Quality
Well, now unfortunately we have reached a category where we have to give the Xiaomi Redmi 1S a grade F. You ask why? Well, a smart phone is still a phone, and thus it should support doing phone calls as one of the most basic tasks. And exactly here is where the Xiaomi Redmi 1S is struggling. During our test the 2G and 3G reception was good, but always broke off again and again, just to reconnect some time later. This is not only extremely annoying, it also is eating up the battery real quick. Now we do not know if this is some sort of software glitch or hardware related. Lets just hope it is software related and will be fixed soon. Either way, this is not acceptable and makes the Redmi 1S kinda unusable.
Hoping its just software glitch & have been resolved till now. Its better to wait for proper Redmi 1s reviews & then go ahead. Infact I'm going to get RedMi 1s but wait for some Indian user reviews.
Check Full Review
Review: Xiaomi Redmi 1S | CMM International