here is my pings on a spark VDSL connection.
Tracing route to 24.105.30.129 over a maximum of 30 hops
1 2 ms 1 ms 1 ms 192.168.1.1
2 * * * Request timed out.
3 * 6 ms 5 ms mdr-ip24-int.msc.global-gateway.net.nz [122.56.116.6]
4 15 ms 6 ms 17 ms ae8-10.akbr6.global-gateway.net.nz [122.56.116.5]
5 6 ms 5 ms 5 ms ae2-6.tkbr12.global-gateway.net.nz [122.56.127.17]
6 134 ms 145 ms 138 ms xe7-0-1-10.lebr7.global-gateway.net.nz [202.50.232.162]
7 134 ms 133 ms 140 ms ae0-10.lebr8.global-gateway.net.nz [202.50.232.42]
8 143 ms 129 ms 129 ms los-brdr-01.inet.qwest.net [63.235.40.241]
9 159 ms 152 ms 134 ms los-edge-07.inet.qwest.net [67.14.102.146]
10 130 ms 131 ms 131 ms 65.153.29.230
11 141 ms 152 ms 134 ms 37.244.0.35
12 148 ms 132 ms 131 ms 37.244.0.103
13 135 ms 135 ms 135 ms 24.105.30.129
Trace complete.
Tracing route to 103.4.115.248 over a maximum of 30 hops
1 2 ms 1 ms 1 ms 192.168.1.1
2 * * * Request timed out.
3 * * * Request timed out.
4 75 ms 6 ms 5 ms ae8-10.akbr6.global-gateway.net.nz [122.56.116.5]
5 6 ms 5 ms 5 ms ae7-2.akbr7.global-gateway.net.nz [122.56.119.53]
6 35 ms 30 ms 30 ms xe7-0-2.sgbr3.global-gateway.net.nz [202.50.232.10]
7 33 ms 29 ms 29 ms ae7-10.sebr4.global-gateway.net.nz [122.56.127.214]
8 34 ms 29 ms 29 ms as55497.nsw.ix.asn.au [218.100.52.65]
9 29 ms 29 ms 29 ms 103.4.115.248
Trace complete.
not a huge deal of difference, certainly nothing to show the issue is with your connection
I tend to agree with hio77 and think something else it at play here.
can you flash the spark firmware on the vodafone device?