It sounds like you may be on a poor network.
My provider offers 2G (GPRS) and 3G (HPDSA) networks the former is crap, the latter as fast as wifi.
My network downgrades automagically but doesn't upgrade automagically. To do that (Android-4.1.2) I have to:
2g download: 0-88kbps
3g 3000 - 5000kbps
1. Turn off mobile data.
2. Settings/More Settings/ mobile networks/network operators. This starts a lengthy search. 2 entries show for my provider, and I select the first. It registers (Hopefully)
3. Turn on mobile data.
HTH
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