Namibia has two cellular operators, MTC and Leo.
Prepaid packages are available.
Prepaid mobile internet packages are available.
Leo uses Blackberries.
Query reception in remote areas with local operators and / or accommodation establishments before reporting coverage to travellers.

Notes on the coverage map and mobile reception
The map above is a rough indication of coverage, drawn from maps provided by the mobile service providers, reported correct at October 2010. Use the map as a guideline only. Expect to receive reception on most major highways, all major cities and many towns and villages. Do not expect to receive reception at some of Namibia's most isolated traveller attractions. Variation in coverage depends on terrain, building structures, atmospheric conditions and weather. Use the reception strength indicator on the handset to ascertain the likelihood of being able to place a call.
Source:Tour Brief