problems with a huawei 4g modem

[jara]

hi im wondering if anyone has used a 4g modem(Telcel) to connect your flightradar24 raspberrypi, im havieng troubles with mine, i can connect it in my house to my regular isp (Telmex) and Works fine, im trying to cnnect it in an airport using a 4g modem via rj45 cable (cause its and old device, i thing its a raspberry 2 or type b device), and doesnt work, im trying to Access the raspi and the login user: pi and pass: raspberry dont work, any help in the 4g thing or the pass and user?