Vodafone have been running for ages and must have been doing something right to become the world’s largest mobile operator.
The success largely has not resulted in complacency although their customers. having said that, their call centers are based in the UK. Vodafone’s prices are fairly average and offer tempting "freebees" When you top up.
Vodafone don’t have the best 2G coverage in some areas but are improving all the work.