The e stands for EDGE. It is simply a reference to the type of 3g signal you are receiving.
Try Settings-Call Settings for changing call forwarding.
This may be of some help. There is a downloadable PDF under one of the links.
Huawei P10 review
1995-2015: How technology has changed the world in 20 years
How VR is being used to simulate space
New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.