Angola

Basics
There are 2 network operators in Angola:

Unitel is the largest provider in Angola wheareas Movicel is partially owned by the state telephone company.
 * Unitel
 * Movicel

Pre-paid SIM cards are available in their outlets and from street vendors. Registration is mandatory, and in case you have bought your SIM from a street vendor, you will have to visit an outlet of your chosen provider for registration. Bring your passport and valid visa or residence permit in order to allow for mandatory registration, otherwise your SIM card may get suspended until the registration has been processed.

Typical for Angola is that telecom operators quote the charges in units (UTT). Each unit is at this moment 7.2 Kwanza's (Kz), which is roughly 0.045 USD.

Unitel
Unitel is the market leader and owned by multiple companies. Their network covers every major population area and has about 9 million subscribers (including pre-paid). The network has launched data coverage including 4G LTE.

Availablity
SIM cards are available at their stores: branches locator. And from street vendors. You can check the registration status online.

 Recharge cards are available in 50,125,375, 625 and 1250 Units. The smallest extends the validity for 10 days, whereas the largest is good for 180 days of validity. To recharge the account you can dial 19101 and follow the instructions or dial *101*rechargecode#. To check your balance and other options dial *111#.

Data featured packages
The standard rate is "Net Light" at 2.5 UTT per MB. Accessing facebook via zero.facebook.com and wikipedia via m.wikipedia.com is for free.

A day pass for 200 MB is available for 27.78 UTT (200 Kz)

For buying following "BIG NET" data packages you text "NET" plus the value in UTT eg."NET 125" to 19107. 

More info
Website (Portuguese only): Unitel