How does ESIM work and what are its benefits? <nis:link nis:type=tag nis:id=eSim nis:value=eSim nis:enabled=true nis:link/> <nis:link nis:type=tag nis:id=technology nis:value=technology nis:enabled=true nis:link/> <nis:link nis:type=tag nis:id=sparknews nis:value=sparknews nis:enabled=true nis:link/> <nis:link nis:type=tag nis:id=sparknewsin nis:value=sparknewsin nis:enabled=true nis:link/> <nis:link nis:type=tag nis:id=technicalmantra nis:value=technicalmantra nis:enabled=true nis:link/> <nis:link nis:type=tag nis:id=techmantra nis:value=techmantra nis:enabled=true nis:link/>