My phone doesn't come up with the 3G/4G network......i have done everything, from setting the preferred network mode to 4G/3G/2G and even have my APN settings intact, i have had similar issues with ny previuos device but i got it easily fixed with MTK engineering mode, but my Huawei Honor 4a runs on a Qualcomm processor...pls i need urgent help, because this 2G is quite slow with downloads...thanks in advance.