^^ Not sure about other providers, but BSNL 2G sim should be migrated to 3G to get 3G speeds. After the migration you can't use GPRS package. IIRC, the message is M3G to 53733. If the sim is not migrated, the speed is capped in 3G network. I'm getting constant 30kBps using 2G sim in 3G network while it is just 10kBps in 2G network. My phone is 3G.
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