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For those of you who lose 4G LTE signals or even 3G signals after installing a new custom ROM on your Verizon Galaxy S3 SCH-I535, here’s how to fix it easily. Also, you can use this method to change between 3G and 4G LTE to save battery life on Touchwiz-enabled ROMs.
You can download this app called “Phone Info” and open it.
Under “Device info”, make sure the mode is set to “LTE/CDMA/EvDo”. This will make sure you get 4G LTE signals.
To force 3G only (so you can save battery life), you can set it to “CDMA auto (PRL)”.