To verify if the number is valid (active on any network), you can request a Home Location Register (HLR) lookup.
HTTP GET: https://hlr.mobivatebulksms.com/?lookup={msisdn,msisdn,...}&username={your username}&password={your password}
{
results: [
{
to: "4474*******",
mccMnc: "23430",
imsi: "23430",
originalNetwork: {
networkName: "T-Mobile UK (Everything Everywhere Limited)",
networkPrefix: "74326",
countryName: "United Kingdom",
countryPrefix: "44"
},
ported: false,
status: {
groupId: 3,
groupName: "DELIVERED",
id: 5,
name: "DELIVERED_TO_HANDSET",
description: "Message delivered to handset"
},
error: {
groupId: 0,
groupName: "OK",
id: 0,
name: "NO_ERROR",
description: "No Error",
permanent: false
}
},
{ ... },
]
}