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Samsung Guru Music 2 Questions & Answers

No. You cannot use 4g network sim cards. You need to select 2G network for your sim card and then you can use it.

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No. Samsung Guru Music 2 do not support CDMA sim cards. 

Samsung B310 comes with 800 mAh battery. But it is very efficient. You do not require to charge the phone for almost 3 days with moderate usage. 

Yes, you can do conference calls from this mobile phone.