suggest me the best mobile phone wit affordable cost.

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Iam plannin to buy a mobil phone wit all the best featurs running in market,iam having two no 1 is 4 my personal use n other is for my office purpose so thaught to buy a dual sim based mobil,but heard tat we cant use both no at a time.n very recenlty saw a china mobile having this feature n cost is very affordable n having tremendious featurs in it.so my frnds are saying that it wont long last n very delicate to use.so suggest me the best one according to uu....