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settings/more (under wireless and network section)/cellular networks - Preferred network type
if it stil stays on E...probably your SIM or network provider has not compatible frequency.
if it's under warranty, please contact Acer support service or try a factory reset (backup your data first)
settings/backup & reset - factory data reset
by the way, i suspect the phone doesn't support the network frequency of your country.
i tried the factory reset but it doesn't help sir . if it doesn't support the frequency here in my country what can i do about it
nothing, apart ask to your network provider the supported frequency and on phone specifications.