International Roaming MC7455

IoT Modules MC/EM Series
1

Hello everyone. Appreciate any feedback in advance…

I have been trying to solve this problem for coming up on 6 months now. Sprint tells me that the MC7455 is unable to roam internationally in Canada, yet I have a EM7455 (which from what I understand is identical module electrically and firmware wise).

This is what they last told me:

"After reviewing the plan and device in depth we have come to the conclusion that this device does not have the capability to roam internationally. Per the user guide the device can connect to the following networks: LTE / DC-HSPA+ / HSPA+ / HSPA / UMTS (WCDMA) operation. The device will need the ability to connect to the GSM network in order to roam internationally. The other device mentioned that is working (SW EM7455) has the ability to connect to the following networks: LTE, DC-HSPA+, HSPA+, HSDPA, HSUPA, WCDMA, GSM, GPRS, EDGE, CDMA, and GNS. Since GSM is one of those networks, it is able to connect and roam internationally. You can reach out to Sierra Wireless to see if they can suggest a workaround or comparable device you could use instead. But this particular device (SW MC7455) will not roam internationally. "

Can anyone confirm that this is indeed true with the MC7455 not being able to do GSM?

Thank you in advance!

2

I’m not a Sprint expert but it looks like Sprint has only GSM roaming agreements internationally with other carriers.

Correct, the MC7455 does not support GSM.

The supported bands are available in the PTS – Product Specification guide – on the source https://source.sierrawireless.com/)

Thanks,

James

3

I believe that is correct, you would need to set the module to LTE mode (AT!Selrat=6) to roam on LTE.

4

Thank you both for the responses. @Thor are you saying that the MC7455 would indeed roam in Canada if the module was set to LTE mode? I will try this. Thank you!

5

You maybe abe to roam on LTE provided home carrier in this case Sprint has roaming partner agreements in Canada and your data plan supports it.

6

Hi there,
The Sprint roaming issue troubled us for quite a long time. It turned out that the module has to be in LTE mode (AT!SELRAT=6) to roaming in Canada. Below is some information if helps:
at+cgdcont?
+CGDCONT: 1,“IP”,“otasn”,“0.0.0.0”,0,0,0,0
+CGDCONT: 3,“IPV4V6”,“r.ispsn”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0

OK
at+cgcontrdp
+CGCONTRDP: 3,5,r.ispsn,108.105.193.225,68.28.31.30,68.28.31.31 <== Attach APN is r.ispsn

OK
at+cops?
+cops: 0,0,“TELUS”,7 <== roaming on Telus

OK
at!gstatus?
!GSTATUS:
Current Time: 477 Temperature: 26
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Attached
LTE band: B4 LTE bw: 15 MHz
LTE Rx chan: 2325 LTE Tx chan: 20325
LTE CA state: NOT ASSIGNED
EMM state: Registered Normal Service
RRC state: RRC Idle
IMS reg state: No Srv

PCC RxM RSSI: -53 RSRP (dBm): -90
PCC RxD RSSI: -93 RSRP (dBm): -136
Tx Power: – TAC: 2B02 (11010)
RSRQ (dB): -18.0 Cell ID: 01B0BF00 (28360448)
SINR (dB): 17.2

OK

7

@dwen thanks for the info. I tried changing AT!SELRAT=6 and still didn’t get any luck. Would there be something else i’m missing?

8

Would you please confirm with Sprint about your roaming policy? When we did the test, Sprint enabled the international roaming for the module and SIM pair, after many struggles, they told us to set to LTE only mode.

9

Roaming policy is solely the carrier’s decision so there isn’t much Sierra can do. Sprint network only supports CDMA/EVDO and LTE so when it comes to roaming, setting the module to LTE only mode as suggested by Sprint should work.