unfortunately Huawei B593 is not compatible to pure lte(MTN).
please refer to article below .
"Afrihost can only allow devices which have been network approved by MTN and have identified a range of devices which specifically suite a Fixed LTE offer, and which are sometimes offered by competitors. This range of devices includes:
- Huawei B525
- Huawei B612
- Huawei B618
- ZTE MF286
Please note that Pure LTE (MTN) will only work on the above approved devices. If you insert your SIM card into a device that has not been approved by MTN, your SIM card will be blocked and you will lose internet access. You will then have to contact Afrihost Support to get your SIM card unblocked."