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44	44	== 2.2 Speed Up Network Attach time ==
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46	46
47		-BC660K-GL supports multi bands (% style="color:blue" %)**B1/B2/B3/B4/B5/B8/B12/B13/B14/B17/B18/B19/B20/B25/B28/B66/B70/B85. **(%%) It will search one by one and try to attach, this will take a lot of time and even cause attach fail. User can lock the band to specify band for its operator to make this faster.
	47	+BC660K-GL supports multi bands (% style="color:blue" %)**B1/B2/B3/B4/B5/B8/B12/B13/B14/B17/B18/B19/B20/B25/B28/B66/B70/B85. **(%%) It will search one by one and try to attach, this will take a lot of time and even cause attach fail and show Signal Strenght:99. User can lock the band to specify band for its operator to make this faster.
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49	49	(% style="color:#037691" %)**AT+QBAND?       **(%%) ~/~/ Check what is the current used frequency band
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621	621	(% style="color:blue" %)**See result in TCP Server:**
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623	623	[[image:image-20230807233631-2.png]]
	624	+
	625	+
	626	+= 4. Trouble Shooting: =
	627	+
	628	+== 4.1 Checklist for debuging Network Connection issue. Signal Strenght:99 issue. ==
	629	+
	630	+There are many different providers provide NB-IoT service in the world. They might use different band, different APN & different operator configuration. Which makes connection to NB-IoT network is complicate.
	631	+
	632	+If end device successfully attached NB-IoT Network, User can normally see the signal strengh as below (between 0~~31)
	633	+
	634	+[[image:image-20240207002003-1.png]]
	635	+
	636	+
	637	+If fail to attach network, it will shows signal 99. as below:
	638	+
	639	+[[image:image-20240207002129-2.png]]
	640	+
	641	+
	642	+(% class="lead" %)
	643	+When see this issue, below are the checklist:
	644	+
	645	+* Does your SIM card support NB-IoT network? If SIM card doesn't not specify support NB-IoT clearly, normally it doesn't support. You need to confirm with your operator.
	646	+* Do you configure the correct APN? [[Check here for APN settings>>http://wiki.dragino.com/xwiki/bin/view/Main/General%20Configure%20to%20Connect%20to%20IoT%20server%20for%20-NB%20%26%20-NS%20NB-IoT%20models/#H2.1GeneralConfiguretoattachnetwork]].
	647	+* Do you lock the frequency band? This is the most case we see. [[Explain and Instruction>>http://wiki.dragino.com/xwiki/bin/view/Main/General%20Configure%20to%20Connect%20to%20IoT%20server%20for%20-NB%20%26%20-NS%20NB-IoT%20models/#H2.2SpeedUpNetworkAttachtime]].
	648	+* Check if the device is attached to Carrier network but reject. (need to check with operator).
	649	+* Check if the antenna is connected firmly.
	650	+
	651	+If you have check all above and still fail. please send console log files (as many as possible) to [[support@dragino.com>>mailto:support@dragino.com]] so we can check.
	652	+
	653	+