Telkom has launched new Sim-only mobile data plans for “on-the-go customers” that dramatically undercut the prices charged by its rivals.

The new plans include a 20GB option (plus 20GB of “night surfer” data for use between midnight and 7am) priced at R355/month. Other plans are also aggressively priced — 1GB of data (plus 1GB night surfer), for example, costs R40, while 10GB (plus 10GB) fetches R200 (see table below).

The new one-the-go plans come just a day after Telkom cut the price of its fixed-LTE prepaid and contract wireless broadband plans, known as SmartBroadband Wireless.

“The main difference between the new mobile data plans and the existing SmartBroadband Wireless plans is that the mobile data plans allow for data usage on both the Telkom and roaming partner (Vodacom) networks, whereas the SmartBroadband LTE plans only allow for data usage on the Telkom mobile network,” the company said on Wednesday.

“The target market for the new mobile data plans is the mobile individual, students and people whom require a secondary data connection while they are away from the office, home or not always within a Telkom mobile coverage area.”

The inclusive data on the new mobile data plans has a validity period of two calendar months. Unused inclusive data will be depleted first before the new monthly data allocation is used.

The night surfer data will only work on the Telkom network, is valid for one calendar month, does not roll over and is not transferrable.