# New sim card never connect (8h+) but connect instantly when forcing RAT to LTE **URL:** \ **Category:** FX30\ **Tags:** debug\ **Created:** [March 4, 2025, 2:28pm UTC](https://forum.sierrawireless.com/t/new-sim-card-never-connect-8h-but-connect-instantly-when-forcing-rat-to-lte/34581 "2025-03-04T14:28:39Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![jonathanr](https://avatars.discourse-cdn.com/v4/letter/j/9e8a1a/32.png) [@jonathanr](https://forum.sierrawireless.com/u/jonathanr)\ **Post date:** [March 4, 2025, 2:28pm UTC](https://forum.sierrawireless.com/t/new-sim-card-never-connect-8h-but-connect-instantly-when-forcing-rat-to-lte/34581/1 "2025-03-04T14:28:39Z")
Hi, We have FX30(WP7611-1) deployed in multiples markets and for most/all of our sim card/operators we have no problem. Now comes the pickle, we also have sim cards from/for Magenta Telekom. When we insert a “brand new sim card”, we never successfully connect (waited 8+ hours). But if we use a sim card coming from one of our other modem we support and we know get a connection, the modem get connectivity right away. We toyed quite a lot to understand what was going on and eventually we decided to play with the RAT. Our default is `Auto` and it seems like forcing it to LTE result in a functional state (95% of the time). Now, while this seems like a mitigation, we do not understand why that happens and thus we cannot just pray that it always works when we deploy devices around the globe. Which is why we are here. We have a hunch that it is related to the fact that those sim card do not have preferred network out of the box since these are multi-carrier/operator (not sure if that is the right term). We also saw mentions that the modem might be scanning all freqs in that case.([FX30 with Verzon: Can't Connect to network - #8 by cchenry](https://forum.sierrawireless.com/t/fx30-with-verzon-cant-connect-to-network/21316/8)). We do have special setup in for our other modems: Quectels: AT+QCFG=“nwscanseq” Gemalto: ^SCFG: “Radio/CNS” “Fast mode” Is there an equivalent for FX30 ? (Had a look at the AT reference and the closest I got to i maybe force a “prefered” RAT for acquisition (!SELRAT) but it is unclear to me what acquisition means here. Some info dump for context: ```auto ATI3 Manufacturer: Sierra Wireless, Incorporated Model: FX30(WP7611-1) Revision: SWI9X07Y_02.37.03.00 73df45 jenkins 2020/04/08 10:59:14 IMEI: 352588320143405 IMEI SV: 14 FSN: ZW315200270610 +GCAP: +CGSM ``` ```auto ATI8 Legato Ver: 19.11.5.cdc94bb9_fa5a606a7dc8c397dd98e6abdb975bac_modified Yocto Ver: SWI9X07Y_02.37.10.02 2022-02-17_11:09:54 OS Ver: Linux version 3.18.140 (oe-user@oe-host) (gcc version 7.3.0 (GCC) ) #1 PREEMPT Thu Feb 17 11:02:54 UTC 2022 LK Ver: 1.3.0_482d4b1057 RootFS Ver: SWI9X07Y_02.37.10.02 2022-02-17_11:09:54 UserFS Ver: unknown MCU Ver: unknown ``` ```auto AT!BAND? Index, Name 00, All bands ``` ```auto AT+KSRAT? +KSRAT: 0 ``` XXX is redacted. ```auto AT+CGDCONT? +CGDCONT: 1,"IP","internet.XXXX.iot","0.0.0.0",0,0,0,0 +CGDCONT: 2,"IPV4V6","ims","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0 +CGDCONT: 3,"IPV4V6","sos","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,1 ``` The following are done with a “working” sim (after LTE RAT forced). ```auto AT*PSRDBS? *PSRDBS: 6917535626593305024 ``` ```auto AT+CEREG? +CEREG: 0,5 ``` ```auto AT+COPS? +COPS: 0,0,"Rogers Wireless",7 ``` ```auto AAT+COPS=3,2 AT+COPS? +COPS: 0,2,"302720",7 ``` ```auto AT+CGACT? +CGACT: 1,1 +CGACT: 2,0 +CGACT: 3,0 ``` ```auto !GSTATUS: Current Time: 43867 Temperature: 30 Modem Mitigate Level: 0 ModemProc Mitigate Level: 0 Reset Counter: 1 Mode: ONLINE System mode: LTE PS state: Attached IMS reg state: NOT REGISTERED IMS mode: Normal IMS Srv State: NO SMS,NO VoIP LTE band: B2 LTE bw: 15 MHz LTE Rx chan: 1075 LTE Tx chan: 19075 LTE CA state: INACTIVE EMM state: Registered Normal Service RRC state: RRC Connected PCC RxM RSSI: -89 RSRP (dBm): -114 PCC RxD RSSI: -88 RSRP (dBm): -118 Tx Power: -- TAC: 61EA (25066) RSRQ (dB): -11 Cell ID: 01075117 (17256727) SINR (dB): 11.4 ``` Unfortunately I do not have a “fresh” sim card right now but I will provide the same information with a “faulty” one ASAP. Greatly appreciate any help that could get us out of the mud. Thanks ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [March 4, 2025, 3:12pm UTC](https://forum.sierrawireless.com/t/new-sim-card-never-connect-8h-but-connect-instantly-when-forcing-rat-to-lte/34581/2 "2025-03-04T15:12:26Z")
The signal strength seems to be bad > **[Understanding LTE Signal Strength Values | Digi International](https://www.digi.com/support/knowledge-base/understanding-lte-signal-strength-values)** How about using AT+cops in manual mode? Which carrier are you using? ---
**Author:** ![jonathanr](https://avatars.discourse-cdn.com/v4/letter/j/9e8a1a/32.png) [@jonathanr](https://forum.sierrawireless.com/u/jonathanr)\ **Post date:** [March 4, 2025, 3:30pm UTC](https://forum.sierrawireless.com/t/new-sim-card-never-connect-8h-but-connect-instantly-when-forcing-rat-to-lte/34581/3 "2025-03-04T15:30:45Z")
The aim here is to let the “modem”/“sim” decides since this is the big advantages of Magenta on our side, they have contract with a lot of carrier (network operator, sorry if I am confusing terminology here) in different markets. So the aim is to be as “agnostic” as possible on that front. For example, right now I am in Montreal so the carrier chosen is Rogers but we have devices (fx30) in the field in Chicago that choose between ATT and T-Mobile depending on the signal at each locations. Wouldn’t forcing the AT+cops go against that ? Or are you suggesting that the reason it takes time for a “new sim” to “get going” is that the signal is poor ? ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [March 4, 2025, 3:46pm UTC](https://forum.sierrawireless.com/t/new-sim-card-never-connect-8h-but-connect-instantly-when-forcing-rat-to-lte/34581/4 "2025-03-04T15:46:23Z")
Them seems you are using generic pri as it is using roaming network Yes, not sure if the bad signal makes the problem Btw, you might also check at+cpol for the preferred operator list ---
**Author:** ![jonathanr](https://avatars.discourse-cdn.com/v4/letter/j/9e8a1a/32.png) [@jonathanr](https://forum.sierrawireless.com/u/jonathanr)\ **Post date:** [March 4, 2025, 4:13pm UTC](https://forum.sierrawireless.com/t/new-sim-card-never-connect-8h-but-connect-instantly-when-forcing-rat-to-lte/34581/5 "2025-03-04T16:13:17Z")
> [@jyijyi](#): > > at+cpol ```auto AT+CPOL? +CME ERROR: operation not allowed AT+CPOL=? +CME ERROR: operation not allowed ``` I guess that this is not what we expect… Btw thanks for helping. ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [March 4, 2025, 4:26pm UTC](https://forum.sierrawireless.com/t/new-sim-card-never-connect-8h-but-connect-instantly-when-forcing-rat-to-lte/34581/6 "2025-03-04T16:26:33Z")
here is my test: ```auto ati3 Manufacturer: Sierra Wireless, Incorporated Model: WP7608 Revision: SWI9X07Y_02.37.06.05 b15b59 jenkins 2022/09/27 07:54:33 IMEI: 352913090521435 IMEI SV: 18 FSN: XG207430712345 +GCAP: +CGSM,+DS OK at+cpin? +CPIN: READY OK at+cpol? OK at+cpol=? +CPOL: (1-16),(0-2) OK at+cpol=? +CPOL: (1-16),(0-2) OK at+cpls? +CPLS: 0 OK at+cpls=1 OK at+cpol? +CPOL: 1,2,"45400",1,0,1,1 OK at+cpls=2 OK at+cpol? +CPOL: 1,2,"45400",0,0,0,1 OK ``` ---
**Author:** ![jonathanr](https://avatars.discourse-cdn.com/v4/letter/j/9e8a1a/32.png) [@jonathanr](https://forum.sierrawireless.com/u/jonathanr)\ **Post date:** [March 4, 2025, 5:08pm UTC](https://forum.sierrawireless.com/t/new-sim-card-never-connect-8h-but-connect-instantly-when-forcing-rat-to-lte/34581/7 "2025-03-04T17:08:17Z")
Just so we have a comparison: ```auto at+cpin? +CPIN: READY OK at+cpol? +CME ERROR: 3 at+cpol=? +CME ERROR: 3 at+cpls? +CPLS: 0 OK ``` ---
**Author:** ![jonathanr](https://avatars.discourse-cdn.com/v4/letter/j/9e8a1a/32.png) [@jonathanr](https://forum.sierrawireless.com/u/jonathanr)\ **Post date:** [March 4, 2025, 5:12pm UTC](https://forum.sierrawireless.com/t/new-sim-card-never-connect-8h-but-connect-instantly-when-forcing-rat-to-lte/34581/8 "2025-03-04T17:12:46Z")
Sorry did not see there was other commands there, here are the rest: ```auto at+cpol? +CPOL: 2,2,"0001650" +CPOL: 3,2,"166500" +CPOL: 4,2,"015165" +CPOL: 5,2,"1650000" +CPOL: 7,2,"0001650" +CPOL: 8,2,"166500" +CPOL: 9,2,"015165" +CPOL: 10,2,"1650000" +CPOL: 12,2,"0001650" +CPOL: 13,2,"166500" +CPOL: 14,2,"015165" +CPOL: 15,2,"1650000" +CPOL: 17,2,"0001650" +CPOL: 18,2,"166500" +CPOL: 19,2,"015165" +CPOL: 20,2,"1650000" +CPOL: 22,2,"0001650" +CPOL: 23,2,"166500" +CPOL: 24,2,"015165" +CPOL: 25,2,"1650000" +CPOL: 27,2,"0001650" +CPOL: 28,2,"166500" +CPOL: 29,2,"015165" +CPOL: 30,2,"1650000" +CPOL: 32,2,"0001650" +CPOL: 33,2,"166500" +CPOL: 34,2,"015165" +CPOL: 35,2,"1650000" +CPOL: 37,2,"0001650" +CPOL: 38,2,"166500" +CPOL: 39,2,"015165" +CPOL: 40,2,"1650000" +CPOL: 42,2,"0001650" +CPOL: 43,2,"166500" +CPOL: 44,2,"015165" +CPOL: 45,2,"1650000" +CPOL: 47,2,"0001650" +CPOL: 48,2,"166500" +CPOL: 49,2,"015165" +CPOL: 50,2,"1650000" +CPOL: 52,2,"0001650" +CPOL: 53,2,"166500" +CPOL: 54,2,"015165" +CPOL: 55,2,"1650000" +CPOL: 57,2,"0001650" +CPOL: 58,2,"166500" +CPOL: 59,2,"015165" +CPOL: 60,2,"1650000" +CPOL: 62,2,"0001650" +CPOL: 63,2,"166500" +CPOL: 64,2,"015165" +CPOL: 65,2,"1650000" +CPOL: 67,2,"0001650" +CPOL: 68,2,"166500" +CPOL: 69,2,"015165" +CPOL: 70,2,"1650000" +CPOL: 72,2,"0001650" +CPOL: 73,2,"166500" +CPOL: 74,2,"015165" +CPOL: 75,2,"1650000" +CPOL: 77,2,"0001650" +CPOL: 78,2,"166500" +CPOL: 79,2,"015165" +CPOL: 80,2,"1650000" +CPOL: 82,2,"0001650" +CPOL: 83,2,"166500" +CPOL: 84,2,"015165" +CPOL: 85,2,"1650000" ``` ```auto at+cpol? +CPOL: 1,2,"23203" +CPOL: 2,2,"040230" +CPOL: 3,2,"350083" OK ``` ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [March 4, 2025, 5:52pm UTC](https://forum.sierrawireless.com/t/new-sim-card-never-connect-8h-but-connect-instantly-when-forcing-rat-to-lte/34581/9 "2025-03-04T17:52:04Z")
I don’t quite see there is 302720 in the list I remember the module will first try to register HPLMN and then the operator in +CPOL. After that if it still cannot register network, it will try to register other PLMN with received high quality signal, lastly it tries to register other PLMN in order of decreasing signal quality.