After migrating to new intelligent network at Trichi BSNL Kerala began to offer validity with top up recharges. For new mithram customers validity is available with all denominations from Rs. 10. Earlier this was available when the recharges reach a sum amount of 200. For new mithram customers it can be enjoyed with recharges of multiples of 10. The customers of other plans can be change to new mithram plan with a recharge of Rs. 49 or by sending PLAN MITHRAM to 123. With the new mithram plan the customers can enjoy the always full talk time facility for top up of 200, 500 and 1000.
| Top Up Denomination (Rs) | Validity | Extras you get |
| 10 | 9 Days | Talk Time : Rs 8.90 |
| 20 | 18 Days | Talk Time : Rs 15.80 |
| 30 | 27 Days | Talk Time : Rs 23.70 |
| 40 | 36 Days | Talk Time : Rs 32.60 |
| 50 | 45 Days | Talk Time : Rs 41.50 |
| 60 | 54 Days | Talk Time : Rs 50.40 |
| 70 | 63 Days | Talk Time : Rs 59.30 |
| 80 | 72 Days | Talk Time : Rs 68.20 |
| 90 | 81 Days | Talk Time : Rs 77.10 |
| 100 | 90 Days | Talk Time : Rs 86.00 + 50MB Data |
| 110 | 99 Days | Talk Time : Rs 94.90 |
| 120 | 108 Days | Talk Time : Rs 103.80 |
| 130 | 117 Days | Talk Time : Rs 112.70 |
| 140 | 126 Days | Talk Time : Rs 121.60 |
| 150 | 135 Days | Talk Time : Rs 130.50 |
| 160 | 144 Days | Talk Time : Rs 139.40 |
| 170 | 153 Days | Talk Time : Rs 148.30 |
| 180 | 162 Days | Talk Time : Rs 157.20 |
| 190 | 171 Days | Talk Time : Rs 166.10 |
| 200 | 180 Days | Full Talk Time + 50MB Data |