APN for different operator

one of our client is using different sims from different operators
such as airtel: apn:-airtelgprs.com
vodafone: apn:-www
bsnl: apn:-bsnlnet

I have been informed that the sims starts firing no matter what ever apn we are using not related with the operator.

I observed that the client was using airtel and bsnl sims: with incorrect apn in each sim slot , the sims were getting connected but not firing at full strength and it kept on connecting and disconnecting.
BUT As soon as i inserted the correct apn it got connected and it started firing at full strength.


Please advise

We also experienced the same sometimes

When the unit goes to Roaming the APN information becomes incorrect as the SIM may change to different operator and APN changes

It doesn't resume when it come back to its original location

More information can be provided from support and we will discuss with them