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Hi
I bought sony xperia arc s today , but the sim card isn't working , it is showing signals but with a yellow sign saying "emergency calls only" and no connections available
what should I do now ? 
you could restart your phone > check the correct APN settings and also disable or uninstall any taskillers and antivirus
it doesn't hurt to get a brand new SIM card (this is usually the problem)
but the sim is working fine in other phone , and I have tried other sims as well none of them is working
restarting isn't working as well D; APN settings are fine as well
most likely then its the SIM card, if the SIM its older than 6months it will be wise to replace it, for the most part SIM cards are free but it varies per country/carrier/network
hmmm my sim is really old, I will change it then , I hope there is not a problem in handset
most likely that's the problem, also you can use SUS to repair your phone
http://www.sonymobile.com/gb/tools/update-service/
http://www-support-downloads.sonymobile.com/Software%20Downloads/Update_Service_Setup-2.11.12.5.exe
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
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