Hi, I bought a Fona808 shield for my arduino, I bought a sim card with 4G, and run the sample program and here is the output I got:
FONA basic test
Initializing…(May take 3 seconds)
Attempting to open comm with ATs
—> AT
<—
—> AT
<—
—> AT
<— ⸮
—> AT
<— AT
—> ATE0
<— ATE0
—> ATE0
<— OK
—> AT+CVHU=0
<— #*VCC⸮⸮FU: 1
—> ATI
<—
—> AT+CPMS=“SM”,“SM”,“SM”
<—
FONA is OK
Found ???
—> AT+GSN
<— ⸮
Module IMEI: ⸮
[?] Print this menu
[a] read the ADC 2.8V max (FONA800 & 808)
[b] read the Battery V and % charged
[C] read the SIM CCID
[U] Unlock SIM with PIN code
[i] read RSSI
[n] get Network status
[v] set audio Volume
[V] get Volume
[H] set Headphone audio (FONA800 & 808)
[e] set External audio (FONA800 & 808)
[T] play audio Tone
[P] PWM/Buzzer out (FONA800 & 808)
[f] tune FM radio (FONA800)
[F] turn off FM (FONA800)
[m] set FM volume (FONA800)
[M] get FM volume (FONA800)
[q] get FM station signal level (FONA800)
[c] make phone Call
[A] get call status
[h] Hang up phone
[p] Pick up phone
[N] Number of SMSs
[r] Read SMS #
[R] Read All SMS
[d] Delete SMS #
[s] Send SMS
[u] Send USSD
[y] Enable network time sync (FONA 800 & 808)
[Y] Enable NTP time sync (GPRS FONA 800 & 808)
[t] Get network time
[G] Enable GPRS
[g] Disable GPRS
[l] Query GSMLOC (GPRS)
[w] Read webpage (GPRS)
[W] Post to website (GPRS)
[S] create Serial passthru tunnel
and I cant even get the SMS number for the SIM:
FONA> ⸮N
—> AT+CMGF=1
<—
Could not read # SMS
FONA>
Please help me I am stuck.