All 2G and 3G in both postpaid and prepaid are available on data card also. Data card users may consider them as data plans for their data card. 

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1) Postpaid 2G internet plans:-

FMC of plan in Rs./Month*	Free data usage		Additional usage charges with pulse rate of 10KB
	Day/Any time usage	Night Usage
Nil	Nil	Nil	Rs.0.04/10KB
49	300 MB	2 GB	Rs.0.04/10KB
89	3GB^^		Rs.0.04/10KB
199	3 GB^^	4 GB	Rs.0.04/10KB
249	10 GB^^		Rs.0.04/10KB

*Service tax as applicable extra.
^^ Effective from 1 June 2011.
555 Plan has been replaced by Rs300 plan.

2) Prepaid 2G Internet plans:-

MRP of RCV in Rs.^	Free data usage		Additional usage charge with pulse rate of 10KB	Validity in days
	Day/Any time usage	Night Usage
Nil	Nil	Nil	Rs.0.04/10KB	NA
7	100 MB	Nil	Rs.0.04/10KB	1 day
14	200 MB	Nil	Rs.0.04/10KB	3 days
54	500 MB	Nil	Rs.0.04/10KB	30 days
98	2 GB		Rs.0.04/10KB	30 days
219	4 GB^^	4 GB	Rs.0.04/10KB	30 days
270	10GB^^		Rs.0.04/10KB	30 days
300	8GB		Rs.0.04/10KB	90 days

^ MRP of RCV is inclusive of Service Tax @10.30%
^^ Effective from 1 June 2011.
555 Plan is by Rs 300 plan.

Data card rates are also same for mobile users.

According to this table you can say that BSNL has capped an upper limit to its data plans Rs 270 for 10 GB (Earlier we have unlimited data usages in Rs 274) in 2G segment.

Unlimited 3G Data Plans:

	Prepaid (Ctop)	Postpaid (FMC899)
Plans Valid till:	2 April 2012	17 April 2012
Charges per month	MRP: Rs 992/-	FMC Rs 899/-
Usage upto 5GB	3.6Mbps	3.6 Mbps
Usage beyond 5GB	100 Kbps	100 Kbps
Benefit Availability	Home + Roaming	Home + Roaming

Note: Prices could vary by Rs. ±3/- from circle to circle.

New 3G Plans which are available from 1 June 2012:

New Prepaid 3G packs
MRP in Rs. Including S. Tax	Free Usage (in MB)	Validity (In Days)	Remarks
151	1GB	7
250	1.25GB	30
450	2.5GB	30
New Postpaid 3G Packs
222	1.25 GB		Tax extra
400	2.5 GB		Tax extra

Prepaid 3G data plans (aka 3G internet packs)

Current Prepaid packs	New plan from (1 May 2012)
MRP in Rs. Including S. Tax	MRP in Rs. Including tax	Free Usage (in MB)	Validity (In Days)	Remarks
100	No change	225	15
200	No change	500	15
400	300	1,000	30	*From May 1st, 2012
606	600 (90 days validity)*	3,000	30	1000MB (Day)+ 2000MB (Night), *From May 1st, 2012
716	500	2,000	30
1,250 (750)	750	5,000	30
1,800 (1260)	1099	10,000	30
2,250 (1575)	1500	15,000	30
2,500	NA	20,000	60
3,000		30,000	90

Amount in brackets will be available till April 30th, 2012

Postpaid 3G Data plans.

Postpaid Current	Postpaid Effective from 1 May.
FMC in Rs. Including S. Tax	FMC in Rs. Service Tax Extra	Free Usage (in MB)	For Days	Remarks
0		Nil		4p/10KB
369	270	1,000	30	*From May 1st, 2012
549	540	3,000	30	1000MB (Day)+ 2000MB (Night), *3GB anytime From May 1st, 2012
649	450	2,000	30
1,133 (680)	670	5,000	30
1,633 (1143)	1100	10,000	30
2,039 (1427)	1350	15,000	30
NA	2500	30,000	30	New Plan

Amount in brackets will be available till April 30th, 2012
Also All Data usage beyond free bundled use will be charged at 4 paisa/10KB. Earlier it was 2p/10KB.