Netgear LB1120 Roaming
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Launch a web browser from a device that is connected to the modem. The device can be a computer that is directly connected to the modem or a client from a router that is connected to the modem.
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In the address field of your web browser, enter http://192.168.5.1.
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In the Sign In field, enter the modem password and click the Sign In button. The default password is password (case-sensitive).
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Select Settings > Mobile > APN.
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To add a custom APN profile, click the Add button.
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Enter the settings for the new APN profile and click the Save button.
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Click "Connect"

Netgear NightHawk Roaming
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Launch a web browser from a device that is connected to the modem. The device can be a computer that is directly connected to the modem or a client from a router that is connected to the modem.
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In the address field of your web browser, enter http://192.168.1.1.
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Enter the modem password
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Select Settings > Advanced Setting> Cellular.
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Select Roaming Data checkbox
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To edit APN profile, click the edit button(pencil) and change APN to wbdata
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Click Save and Apply when prompt
